Bts night (cp p robstat)
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Mr. Evans teaches Introduction to Probability and Statistics. He has over 17 years of teaching experience and various teaching awards. In his class, students study models, functions, permutations, the binomial theorem, inequalities, linear relationships, probability, and statistics. Homework is assigned daily and checked for completion. Grades are based on tests, quizzes, homework, and projects. Mr. Evans encourages an interactive classroom where students work in pairs and groups.
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Question1The Tri-City School District has instituted a zero-tol.docx
Question1:
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Round your answers to two decimal places, where appropriate.
Mean = Median = Mode =
Question 2:
Recall the following from section 3.1 of the text. Mean : The mean for ungrouped data is obtained by dividing the sum of all values by the number of values in the data set. Median: The median is the value of the middle term in a data set that has been ranked in increasing order. If there is an even number of data, find the average of the two middle data values. Mode: The mode is the value that occurs with the highest frequency in a data set. If there are more than one data values with the highest frequency in a data set, we will have multiple modes. If all data values have the same frequency of occurrences, then the data set has no mode.
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Question 3:
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Question 4:
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Questiono 5:
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%
Question 6:
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5 10 8 7 24 12 5 13 11 10 21 9 8 11 18
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P82 =
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The percentile rank of 11 =
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Assignment 05MA260 Statistical Analysis IDirections Be sure t.docx
Assignment 05
MA260 Statistical Analysis I
Directions: Be sure to save an electronic copy of your answer before submitting it to Ashworth College for grading. Unless otherwise stated, answer in complete sentences, and be sure to use correct English, spelling, and grammar. Refer to the "Assignment Format" page located on the Course Home page for specific format requirements.
NOTE: Show your work in the problems.
1. Compute the mean and variance of the following discrete probability distribution.
x
P(x)
2
.50
8
.30
10
.20
2. The Computer Systems Department has eight faculty, six of whom are tenured. Dr. Vonder, the chair, wants to establish a committee of three department faculty members to review the curriculum. If she selects the committee at random:
a. What is the probability all members of the committee are tenured?
b. What is the probability that at least one member is not tenured? (Hint: For this question, use the complement rule).
3. New Process, Inc., a large mail-order supplier of women’s fashions, advertises same-day service on every order. Recently, the movement of orders has not gone as planned, and there were a large number of complaints. Bud Owens, director of customer service, has completely redone the method of order handling. The goal is to have fewer than five unfilled orders on hand at the end of 95% of the working days. Frequent checks of the unfilled orders follow a Poisson distribution with a mean of two orders. A Poisson distribution is a discrete frequency distribution.
Has New Process, Inc. lived up to its internal goal? Cite evidence.
4. Recent information published by the U.S. Environmental Protection Agency indicates that Honda is the manufacturer of four of the top nine vehicles in terms of fuel economy.
a. Determine the probability distribution for the number of Hondas in a sample of three cars chosen from the top nine.
b. What is the likelihood that in the sample of three at least one Honda is included?
Grading Rubric
Please refer to the rubric below for the grading criteria for this assignment.
CATEGORYExemplarySatisfactoryUnsatisfactoryUnacceptable
15 points11 points7 points3 points
The student provides a clear
and logical table to organize
data and accurately includes
the equations and the correct
answers for the mean and
the variance.
The student provides an
adequate table to organize
data and accurately includes
the equations and the
correct answer for either
the mean or the variance.
The student does not
provide a clear and logical
table to organize data and
accurately includes the
equations and may have
only one correct answer for
the mean or the variance.
The student does not
provide a clear and logical
table to organize data and
has only 1 accurate
equation and one correct
answer for the mean or the
variance.
20 points15 points10 points5 points
The student provides correct
equations and answers for
both parts of the question.
The student provides correct
equatio ...
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Mr. Evans teaches AP Statistics. He has over 17 years of teaching experience and advanced degrees in mathematics and education. The goals of the course are to complete the syllabus, encourage statistical thinking, and promote further study in related fields. The AP exam consists of multiple choice and free response questions and will be on May 11. The course, which satisfies college statistics requirements, focuses on chapters 7-12 and exam preparation. Past students have achieved high pass rates, with over 30% scoring a 5 on the exam. Homework is assigned regularly and grades are based on tests, quizzes, projects, and classwork. Mr. Evans aims to make the course interactive through group work and sees statistics as an engaging subject.
Bts night CALC
Mr. Evans teaches Calculus at H-H High School. He has a B.S. in Mathematics from UT Austin and an M.S. in Education from Wilkes University. He has been teaching at H-H for 15 years. His classes focus on functions, polynomials, continuity, derivatives, integration, and related rates. He provides examples like minimizing the material in a cylindrical can. His homework policy requires a best effort attempt for partial credit. Grades are based on homework, classwork, tests, and quizzes. Students can retake tests for full credit by demonstrating practice of the material. His teaching style is interactive with participation, demonstrations, and group work to make math engaging.
Group c
1) The document outlines an experiment to test the effects of different genres of music (classic rock, country, classical) on the aggression levels of lions.
2) Lions will be captured from different regions of Africa and tested individually in an enclosure. Their aggression levels will be rated on a scale before and after exposure to one song from a randomly assigned music genre.
3) The results will be analyzed separately for male and female lions, with the goal of determining whether music reduces aggression and, if so, which genre is most effective. Blocking and blinding techniques will be used to control for bias.
Grou qq
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Group n
The document describes an experiment to test if toads cause warts by randomly selecting people and rubbing real toads and placebo toads on their left and right arms. The experiment incorporates a control group by using a real toad on one arm and synthetic toad on the other, and blinds subjects to reduce bias while randomizing treatments between arms.
Group L
This document describes a study designed to determine if eating before swimming causes cramps in children ages 6-10. The study uses a matched pairs experimental design. It will involve 3,500 students from 7 elementary schools, with 500 kids selected from each school evenly distributed across grades 1-5. The kids will be blocked by grade and gender then randomly assigned to eat a cheeseburger or have no food before a hour of swimming. They will record if they experience cramps. The experiment will be repeated with each child receiving both treatments on different days to directly compare the effects of eating vs not eating before swimming. Concerns about differences in activity levels, swimming ability, metabolism and pain tolerance between children are noted.
Group dd
This study aims to determine if sugar makes kids hyper by testing 200 children ages 5-12. The children will be randomly assigned to receive either a beverage with 10 teaspoons of sugar or a sugar-free drink. Trained professionals will rate the children's hyperactivity levels before and after consumption. In a randomized block design, 50 boys and 50 girls will be split into two groups, with one group receiving sugar the first week and the other receiving it the second week, to control for gender differences and avoid carryover effects. The study employs double-blinding by not revealing to children or evaluators which treatment was received. Results will be analyzed to see if sugar increases hyperactivity ratings.
Group q
This document outlines an experiment to test the "5 second rule" by dropping different types of food (grapes, carrots, chicken) onto either a hardwood or carpeted floor from 1 foot above. The food will be randomly assigned to the floor types and tested for bacteria compared to a control group of undropped food. There will be 50 pieces of each food split into two groups of 25 to be dropped, with one group going on hardwood and the other on carpet. The experiment aims to see if the floor type affects the amount of dirt or bacteria picked up by the food within 5 seconds of being dropped.
Group pp
This document outlines an experimental design to test if oat bran reduces cholesterol. 1000 volunteers will be randomly assigned to eat either real oat bran or a placebo daily for 3 months. Their cholesterol levels will be measured before and after to see if those eating real oat bran experience greater reductions. Variables like diet, exercise, and medications will be controlled to isolate the effect of oat bran. Statistical analysis will compare cholesterol changes between the two groups and identify any trends in the data. The goal is to determine conclusively if oat bran lowers cholesterol when confounding variables are controlled.
Group p
This study aims to test the hypothesis that shaving hair causes it to grow back thicker. It will involve 150 volunteers divided into two age groups. Volunteers will be randomly assigned to shave their arms and legs once, shave twice, or not shave at all. Hair thickness will be measured before and after using cluster samples. Blocking volunteers by age controls for natural differences in hair growth. The results will show if shaving leads to higher hair concentration when it regrows. Possible errors include volunteers not properly following the shaving treatment.
Group oo
The document describes a proposed experiment to test whether spicy foods cause ulcers. It would involve randomly assigning 600,000 volunteers to eat either spicy or non-spicy meals for 3 months. The volunteers would be blocked into groups by race (Asian, African American, Caucasian) to see if race impacts results. After 3 months, each person would be checked for ulcers. The experiment aims to control for factors like race through blocking and uses random assignment and a large sample size for replication. However, it cannot fully account for individual ulcer risks or ensure participants follow their assigned diets.
Group o
This study examines whether eating oat bran reduces cholesterol levels. It involves 100 American males aged 30-70, split into groups of 50 with high cholesterol and 50 with healthy levels. The men are randomly assigned to eat either meals with 3 servings of oat bran per day or meals with 0 servings for two weeks. Their cholesterol is measured after two weeks and two months later after switching diets. The study uses blocking by separating the groups and blinding by not informing subjects about the oat bran to reduce bias in results. A concern is other lifestyle factors may affect cholesterol without the researchers' knowledge.
Group nn
The document describes an experiment to test if toads cause warts. It involves dividing 300 young people who have never had warts into 3 groups. Group 1 would hold toads for 5 minutes, Group 2 for 3 minutes, and Group 3 would not touch toads. The presence of warts after the experiment would be the response variable. Random assignment, blocking by gender, and blinding the participants about the real purpose would help make the experiment more reliable. However, concerns include upsetting participants if they develop warts, and difficulty finding people willing to hold toads. The conclusion is that this experimental design does not support the theory that toads cause warts, as no warts appeared in any participants.
Group mm
The document describes an experiment to test whether M&Ms melt in the mouth or in the hand. Sixty student volunteers will hold 5 M&Ms in their open hand or closed mouth for 30, 60, or 90 seconds. The M&Ms will then be examined to see if any color remains, indicating melting. Students are randomly assigned to time groups to block for potential time effects. The experiment aims to see if M&Ms melt differently in the hand versus mouth.
Group m
This document outlines a proposed experiment to test whether eating chocolate causes acne. The experiment would involve 5000 teenage volunteers between ages 13-19, with 2500 males and 2500 females. Participants would be randomly assigned to eat either real chocolate or a placebo chocolate daily for 30 days. Before and after the trial, evaluators would rank each participant's acne severity from 1 to 10. The results would be analyzed by comparing acne rankings before and after to determine if real chocolate caused more acne than the placebo. If real chocolate resulted in significantly worse acne, it would indicate chocolate does cause acne.
Group ll
This document outlines an experiment to test if eating an apple a day keeps the doctor away. It involves randomly assigning 2000 participants (1000 males and 1000 females) to either eat one apple or a placebo apple per day for a year. The number of doctor visits each participant has will be recorded and compared between the apple-eating and placebo groups. Blocking by gender and double blinding both participants and evaluators aims to get a clear result on the effect of daily apple consumption while limiting bias. Concerns include difficulty finding and following all participants for a year and creating a believable placebo apple.
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Question1:
The Tri-City School District has instituted a zero-tolerance policy for students carrying any objects that could be used as weapons. The following data give the number of students suspended during each of the past 12 weeks for violating this school policy.
Find the mean, median, and mode.
Round your answers to two decimal places, where appropriate.
Mean = Median = Mode =
Question 2:
Recall the following from section 3.1 of the text. Mean : The mean for ungrouped data is obtained by dividing the sum of all values by the number of values in the data set. Median: The median is the value of the middle term in a data set that has been ranked in increasing order. If there is an even number of data, find the average of the two middle data values. Mode: The mode is the value that occurs with the highest frequency in a data set. If there are more than one data values with the highest frequency in a data set, we will have multiple modes. If all data values have the same frequency of occurrences, then the data set has no mode.
26,32,27,23,34,33,29,43,23,28
(a) Arrange the data in increasing order:
(b) Calculate the mean. The mean =
Question 3:
The following data represent the 2011 guaranteed salaries (in thousands of dollars) of the head coaches of the final eight teams in the 2011 NCAA Men's Basketball Championship. The data represent the 2011 salaries of basketball coaches of the following universities, entered in that order: Arizona, Butler, Connecticut, Florida, Kansas, Kentucky, North Carolina, and Virginia Commonwealth. (Source: www.usatoday.com)
1950,434,2300,3575,3376,3800,1655,418
Compute the range, variance and standard deviation for these data.
Round your answers to the nearest integer, where appropriate.
Range = $
Variance =
Standard deviation = $
Question 4:
The 2011 gross sales of all firms in a large city have a mean of $3.6 million and a standard deviation of $0.7 million. Using Chebyshev′s theorem, find a lower bound on the percentage of firms in this city that had 2011 gross sales between $0.8 and $6.4 million.
Round the answer to the nearest percent.
The lower bound on the percentage is at least %
Questiono 5:
The 2011 gross sales of all firms in a large city have a mean of $2.4 million and a standard deviation of $ 0.6 million. Using Chebyshev's theorem, find at least what percentage of firms in this city had 2011 gross sales of $1.0 to $3.8 million. Round your answer to the nearest whole number.
%
Question 6:
The following data give the weights (in pounds) lost by 15 members of a health club at the end of two months after joining the club.
5 10 8 7 24 12 5 13 11 10 21 9 8 11 18
(a) Calculate the approximate value of the 82nd percentile, denoted P82.
P82 =
(b) Find the percentile rank of 11.
Give the answer rounded to the nearest percent.
The percentile rank of 11 =
Question 7:
In a group of households, the national news is watched on one of the following networks – ABC, CBS ...
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Unit 7 jcs md
This document summarizes key concepts about proportional reasoning. It defines proportional reasoning as a mathematical relationship between two quantities that involves a constant multiplicative relationship. It discusses proportional reasoning as developing between concrete and formal operations. It also provides examples of using proportional relationships to solve problems and discusses research on how to best teach proportional reasoning concepts to students.
Assignment 05MA260 Statistical Analysis IDirections Be sure t.docx
Assignment 05
MA260 Statistical Analysis I
Directions: Be sure to save an electronic copy of your answer before submitting it to Ashworth College for grading. Unless otherwise stated, answer in complete sentences, and be sure to use correct English, spelling, and grammar. Refer to the "Assignment Format" page located on the Course Home page for specific format requirements.
NOTE: Show your work in the problems.
1. Compute the mean and variance of the following discrete probability distribution.
x
P(x)
2
.50
8
.30
10
.20
2. The Computer Systems Department has eight faculty, six of whom are tenured. Dr. Vonder, the chair, wants to establish a committee of three department faculty members to review the curriculum. If she selects the committee at random:
a. What is the probability all members of the committee are tenured?
b. What is the probability that at least one member is not tenured? (Hint: For this question, use the complement rule).
3. New Process, Inc., a large mail-order supplier of women’s fashions, advertises same-day service on every order. Recently, the movement of orders has not gone as planned, and there were a large number of complaints. Bud Owens, director of customer service, has completely redone the method of order handling. The goal is to have fewer than five unfilled orders on hand at the end of 95% of the working days. Frequent checks of the unfilled orders follow a Poisson distribution with a mean of two orders. A Poisson distribution is a discrete frequency distribution.
Has New Process, Inc. lived up to its internal goal? Cite evidence.
4. Recent information published by the U.S. Environmental Protection Agency indicates that Honda is the manufacturer of four of the top nine vehicles in terms of fuel economy.
a. Determine the probability distribution for the number of Hondas in a sample of three cars chosen from the top nine.
b. What is the likelihood that in the sample of three at least one Honda is included?
Grading Rubric
Please refer to the rubric below for the grading criteria for this assignment.
CATEGORYExemplarySatisfactoryUnsatisfactoryUnacceptable
15 points11 points7 points3 points
The student provides a clear
and logical table to organize
data and accurately includes
the equations and the correct
answers for the mean and
the variance.
The student provides an
adequate table to organize
data and accurately includes
the equations and the
correct answer for either
the mean or the variance.
The student does not
provide a clear and logical
table to organize data and
accurately includes the
equations and may have
only one correct answer for
the mean or the variance.
The student does not
provide a clear and logical
table to organize data and
has only 1 accurate
equation and one correct
answer for the mean or the
variance.
20 points15 points10 points5 points
The student provides correct
equations and answers for
both parts of the question.
The student provides correct
equatio ...
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More from texasexe
Ap stats bts(2nd semester)
Mr. Evans teaches AP Statistics. He has over 17 years of teaching experience and advanced degrees in mathematics and education. The goals of the course are to complete the syllabus, encourage statistical thinking, and promote further study in related fields. The AP exam consists of multiple choice and free response questions and will be on May 11. The course, which satisfies college statistics requirements, focuses on chapters 7-12 and exam preparation. Past students have achieved high pass rates, with over 30% scoring a 5 on the exam. Homework is assigned regularly and grades are based on tests, quizzes, projects, and classwork. Mr. Evans aims to make the course interactive through group work and sees statistics as an engaging subject.
Bts night CALC
Mr. Evans teaches Calculus at H-H High School. He has a B.S. in Mathematics from UT Austin and an M.S. in Education from Wilkes University. He has been teaching at H-H for 15 years. His classes focus on functions, polynomials, continuity, derivatives, integration, and related rates. He provides examples like minimizing the material in a cylindrical can. His homework policy requires a best effort attempt for partial credit. Grades are based on homework, classwork, tests, and quizzes. Students can retake tests for full credit by demonstrating practice of the material. His teaching style is interactive with participation, demonstrations, and group work to make math engaging.
Group c
1) The document outlines an experiment to test the effects of different genres of music (classic rock, country, classical) on the aggression levels of lions.
2) Lions will be captured from different regions of Africa and tested individually in an enclosure. Their aggression levels will be rated on a scale before and after exposure to one song from a randomly assigned music genre.
3) The results will be analyzed separately for male and female lions, with the goal of determining whether music reduces aggression and, if so, which genre is most effective. Blocking and blinding techniques will be used to control for bias.
Grou qq
The document describes a proposed experiment to study the effects of waiting different lengths of time after eating before swimming. It would involve 300 volunteers randomized into age groups and waiting times of 15, 30, or 60 minutes after eating before swimming. The response variable measured would be whether the volunteers get sick or experience cramps. Controls, randomization, and replication are used to reduce bias and variability. Factors like allergies, swimming style, and pain tolerance could also influence the results.
Group n
The document describes an experiment to test if toads cause warts by randomly selecting people and rubbing real toads and placebo toads on their left and right arms. The experiment incorporates a control group by using a real toad on one arm and synthetic toad on the other, and blinds subjects to reduce bias while randomizing treatments between arms.
Group L
This document describes a study designed to determine if eating before swimming causes cramps in children ages 6-10. The study uses a matched pairs experimental design. It will involve 3,500 students from 7 elementary schools, with 500 kids selected from each school evenly distributed across grades 1-5. The kids will be blocked by grade and gender then randomly assigned to eat a cheeseburger or have no food before a hour of swimming. They will record if they experience cramps. The experiment will be repeated with each child receiving both treatments on different days to directly compare the effects of eating vs not eating before swimming. Concerns about differences in activity levels, swimming ability, metabolism and pain tolerance between children are noted.
Group dd
This study aims to determine if sugar makes kids hyper by testing 200 children ages 5-12. The children will be randomly assigned to receive either a beverage with 10 teaspoons of sugar or a sugar-free drink. Trained professionals will rate the children's hyperactivity levels before and after consumption. In a randomized block design, 50 boys and 50 girls will be split into two groups, with one group receiving sugar the first week and the other receiving it the second week, to control for gender differences and avoid carryover effects. The study employs double-blinding by not revealing to children or evaluators which treatment was received. Results will be analyzed to see if sugar increases hyperactivity ratings.
Group q
This document outlines an experiment to test the "5 second rule" by dropping different types of food (grapes, carrots, chicken) onto either a hardwood or carpeted floor from 1 foot above. The food will be randomly assigned to the floor types and tested for bacteria compared to a control group of undropped food. There will be 50 pieces of each food split into two groups of 25 to be dropped, with one group going on hardwood and the other on carpet. The experiment aims to see if the floor type affects the amount of dirt or bacteria picked up by the food within 5 seconds of being dropped.
Group pp
This document outlines an experimental design to test if oat bran reduces cholesterol. 1000 volunteers will be randomly assigned to eat either real oat bran or a placebo daily for 3 months. Their cholesterol levels will be measured before and after to see if those eating real oat bran experience greater reductions. Variables like diet, exercise, and medications will be controlled to isolate the effect of oat bran. Statistical analysis will compare cholesterol changes between the two groups and identify any trends in the data. The goal is to determine conclusively if oat bran lowers cholesterol when confounding variables are controlled.
Group p
This study aims to test the hypothesis that shaving hair causes it to grow back thicker. It will involve 150 volunteers divided into two age groups. Volunteers will be randomly assigned to shave their arms and legs once, shave twice, or not shave at all. Hair thickness will be measured before and after using cluster samples. Blocking volunteers by age controls for natural differences in hair growth. The results will show if shaving leads to higher hair concentration when it regrows. Possible errors include volunteers not properly following the shaving treatment.
Group oo
The document describes a proposed experiment to test whether spicy foods cause ulcers. It would involve randomly assigning 600,000 volunteers to eat either spicy or non-spicy meals for 3 months. The volunteers would be blocked into groups by race (Asian, African American, Caucasian) to see if race impacts results. After 3 months, each person would be checked for ulcers. The experiment aims to control for factors like race through blocking and uses random assignment and a large sample size for replication. However, it cannot fully account for individual ulcer risks or ensure participants follow their assigned diets.
Group o
This study examines whether eating oat bran reduces cholesterol levels. It involves 100 American males aged 30-70, split into groups of 50 with high cholesterol and 50 with healthy levels. The men are randomly assigned to eat either meals with 3 servings of oat bran per day or meals with 0 servings for two weeks. Their cholesterol is measured after two weeks and two months later after switching diets. The study uses blocking by separating the groups and blinding by not informing subjects about the oat bran to reduce bias in results. A concern is other lifestyle factors may affect cholesterol without the researchers' knowledge.
Group nn
The document describes an experiment to test if toads cause warts. It involves dividing 300 young people who have never had warts into 3 groups. Group 1 would hold toads for 5 minutes, Group 2 for 3 minutes, and Group 3 would not touch toads. The presence of warts after the experiment would be the response variable. Random assignment, blocking by gender, and blinding the participants about the real purpose would help make the experiment more reliable. However, concerns include upsetting participants if they develop warts, and difficulty finding people willing to hold toads. The conclusion is that this experimental design does not support the theory that toads cause warts, as no warts appeared in any participants.
Group mm
The document describes an experiment to test whether M&Ms melt in the mouth or in the hand. Sixty student volunteers will hold 5 M&Ms in their open hand or closed mouth for 30, 60, or 90 seconds. The M&Ms will then be examined to see if any color remains, indicating melting. Students are randomly assigned to time groups to block for potential time effects. The experiment aims to see if M&Ms melt differently in the hand versus mouth.
Group m
This document outlines a proposed experiment to test whether eating chocolate causes acne. The experiment would involve 5000 teenage volunteers between ages 13-19, with 2500 males and 2500 females. Participants would be randomly assigned to eat either real chocolate or a placebo chocolate daily for 30 days. Before and after the trial, evaluators would rank each participant's acne severity from 1 to 10. The results would be analyzed by comparing acne rankings before and after to determine if real chocolate caused more acne than the placebo. If real chocolate resulted in significantly worse acne, it would indicate chocolate does cause acne.
Group ll
This document outlines an experiment to test if eating an apple a day keeps the doctor away. It involves randomly assigning 2000 participants (1000 males and 1000 females) to either eat one apple or a placebo apple per day for a year. The number of doctor visits each participant has will be recorded and compared between the apple-eating and placebo groups. Blocking by gender and double blinding both participants and evaluators aims to get a clear result on the effect of daily apple consumption while limiting bias. Concerns include difficulty finding and following all participants for a year and creating a believable placebo apple.
Group kk
This document outlines a proposed experiment to study whether cell phones cause brain tumors. It would involve randomly assigning 10,000 cell phone users to use either an antenna phone (treatment) or smartphone (control) for two years. The response variable would be development of brain tumors, which would be compared between the two groups. Key elements of the design include using a control group, random assignment, a large sample size, and blocking by gender and age to reduce other influences. However, concerns are raised about the ethics of potentially causing brain tumors in subjects.
Group k
The document describes an experiment to test if eating carrots affects vision. Participants will be randomly assigned to either a control group or experimental group. The experimental group will consume a daily diet with 1 cup of carrots added, while the control group's diet will not include carrots. Both groups will undergo eye exams before and after following their assigned diets for 30 days. The purpose is to see if carrot consumption results in any changes in vision between the initial and final eye exams.
Group jj
1. The study aimed to test if eating carrots improved eyesight over 5 years by having 1000 volunteers (500 males and 500 females split into age groups) eat carrots or not eat carrots daily and comparing their vision prescriptions before and after.
2. Volunteers were randomly assigned to eat carrots or not within their age and gender group to reduce bias.
3. An evaluator who did not know which volunteers ate carrots tested their vision after 5 years to maintain blinding.
4. The results may show improved eyesight in those who ate carrots if confounding variables like inconsistent carrots or eye injuries are controlled for.
Group j
This study aims to determine if Crest toothpaste prevents cavities by randomly assigning families with infants to use either Crest or a generic toothpaste twice daily. The families will be stratified by income into high, middle, and low groups. From each group, 40 families will be randomly selected and also randomly assigned to the Crest or generic toothpaste conditions. When the infants reach age 25, their dentists' records on cavity occurrence over the study period will be collected and compared between the Crest and generic toothpaste groups to see if there is a significant difference, which could prove Crest prevents cavities. Concerns include subjects not following the brushing and toothpaste procedures or dropping out before the study ends.
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- 6. Homework Policy HW assigned almost every day Homework will be checked daily (average of 2 points per assignment) A “best effort attempt” must be made in order to get any credit for an assignment. Homework = Home + Work Extra Help always available Assignments posted on my Canvas Site.
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