Title ABC/123 Version X 1 Time to Practice – Week Three PSYCH/625 Version 1 2 University of Phoenix Material Time to Practice – Week Three Complete both Part A and Part B below. Part A Some questions in Part A require that you access data from Statistics for People Who (Think They) Hate Statistics. This data is available on the student website under the Student Test Resources link. 1. For the following research questions, create one null hypothesis, one directional research hypothesis, and one nondirectional research hypothesis. a. What are the effects of attention on out-of-seat classroom behavior? Research Hypothesis: There will be a relationship between the effects of attention on out-of-seat classroom behavior versus in-seat-classroom behavior. b. What is the relationship between the quality of a marriage and the quality of the spouses’ relationships with their siblings? Null Hypothesis: There will be no relationship in the relationship between the quality of a marriage and the quality of the spouses’ relationship with their siblings. c. What is the best way to treat an eating disorder? One Directional Research Hypothesis: 2. Provide one research hypothesis and an equation for each of the following topics: a. The amount of money spent on food among undergraduate students and undergraduate student-athletes b. The average amount of time taken by white and brown rats to get out of a maze c. The effects of Drug A and Drug B on a disease d. The time to complete a task in Method 1 and Method 2 3. Why does the null hypothesis presume no relationship between variables? 4. Create a research hypothesis tested using a one-tailed test and a research hypothesis tested using a two-tailed test. 5. What does the critical value represent? 6. Given the following information, would your decision be to reject or fail to reject the null hypothesis? Setting the level of significance at .05 for decision making, provide an explanation for your conclusion. a. The null hypothesis that there is no relationship between the type of music a person listens to and his crime rate (p < .05). In Hypothesis Testing, we typically deem a research hypothesis to be significant, if the odds of two means actually being equal are no greater than 1 in 20 or .05 (5%) or less. b. The null hypothesis that there is no relationship between the amount of coffee consumption and GPA (p = .62). c. The null hypothesis that there is a negative relationship between the number of hours worked and level of job satisfaction (p = .51). 7. Why is it harder to find a significant outcome (all other things being equal) when the research hypothesis is being tested at the .01 rather than the .05 level of significance? At the .01 level, there is less room for error because the test is more rigorous. 8. Why should we think in terms of “failing to reject” the null rather than just accepting it? 9. When is it appropriate to use the one-sample z test? 10. What similarity does a z test have ...

1. Title
ABC/123 Version X
1
Time to Practice – Week Three
PSYCH/625 Version 1
2
University of Phoenix Material
Time to Practice – Week Three
Complete both Part A and Part B below.
Part A
Some questions in Part A require that you access data from
Statistics for People Who (Think They) Hate Statistics. This
data is available on the student website under the Student Test
Resources link.
1. For the following research questions, create one null
hypothesis, one directional research hypothesis, and one
nondirectional research hypothesis.
a. What are the effects of attention on out-of-seat classroom
behavior?
Research Hypothesis: There will be a relationship between the
effects of attention on out-of-seat classroom behavior versus in-
seat-classroom behavior.
b. What is the relationship between the quality of a marriage
and the quality of the spouses’ relationships with their siblings?
Null Hypothesis: There will be no relationship in the
relationship between the quality of a marriage and the quality of
the spouses’ relationship with their siblings.
c. What is the best way to treat an eating disorder?

2. One Directional Research Hypothesis:
2. Provide one research hypothesis and an equation for each of
the following topics:
a. The amount of money spent on food among undergraduate
students and undergraduate student-athletes
b. The average amount of time taken by white and brown rats to
get out of a maze
c. The effects of Drug A and Drug B on a disease
d. The time to complete a task in Method 1 and Method 2
3. Why does the null hypothesis presume no relationship
between variables?
4. Create a research hypothesis tested using a one-tailed test and
a research hypothesis tested using a two-tailed test.
5. What does the critical value represent?
6. Given the following information, would your decision be to
reject or fail to reject the null hypothesis? Setting the level of
significance at .05 for decision making, provide an explanation
for your conclusion.
a. The null hypothesis that there is no relationship between the
type of music a person listens to and his crime rate (p < .05).
In Hypothesis Testing, we typically deem a research hypothesis
to be significant, if the odds of two means actually being equal
are no greater than 1 in 20 or .05 (5%) or less.
b. The null hypothesis that there is no relationship between the
amount of coffee consumption and GPA (p = .62).
c. The null hypothesis that there is a negative relationship
between the number of hours worked and level of job
satisfaction (p = .51).
7. Why is it harder to find a significant outcome (all other

3. things being equal) when the research hypothesis is being tested
at the .01 rather than the .05 level of significance?
At the .01 level, there is less room for error because the test is
more rigorous.
8. Why should we think in terms of “failing to reject” the null
rather than just accepting it?
9. When is it appropriate to use the one-sample z test?
10. What similarity does a z test have to a simple z or standard
score?
11. For the following situations, write out a research
hypothesis:
a. Bob wants to know if the weight loss for his group on the
chocolate-only diet is representative of weight loss in a large
population of middle-aged men.
b. The health department is charged with finding out if the rate
of flu per thousand citizens for this past flu season is
comparable to the average rate of the past 50 seasons.
c. Blair is almost sure that his monthly costs for the past year
are not representative of his average monthly costs over the past
20 years.
12. There were about 15 flu cases per week, this flu season, in
the Oshkosh school system. The weekly average for the entire
state is 16 and the standard deviation, is 2.35. Are the kids in
Oshkosh as sick as the kids throughout the state?From Salkind
(2011). Copyright © 2012 SAGE. All Rights Reserved. Adapted
with permission.Part B
Complete the following questions. Be specific and provide

4. examples when relevant.
Cite any sources consistent with APA guidelines.
Question
Answer
The average raw math achievement score for third graders at a
Smith elementary school is 137; third graders statewide score an
average of 124 with a standard deviation of 7. Are the Smith
third graders better at math than third graders throughout the
state? Perform the correct statistical test, applying the eight
steps of the hypothesis testing process as demonstrated on pp.
185–187 of Statistics for People Who (Think they) Hate
Statistics.
What is a research question that you would like to answer?
Write the null and research hypotheses. Would you use a one- or
two-tailed test? Why?
What do we mean when we say that a statistical result is
significant? What is the difference between a statistically
significant and a meaningful result? Why is statistical
significance important?
The meaning of a statistical result is significant is basically
saying that the probability that an effect is not due to chance by
itself, so basically it is a value judgment. In essence any result
in statistics is not considered significant because it is important
rather it has basically been predicted as unlikely to have
occurred by chance alone. The difference between statistically
significant and meaningful result is that statistically significant
means that data is below a certain alpha level, which basically
means that it is considered significant in terms of numbers.
Now, meaningful result is something that is meaningful in real
life. So for example” Say that 10% of heart surgeries fail, and
the desired alpha level is 5%. This data would not be
statistically significant because it is above the alpha level so
statisticians would say it has not meaning, but that is does have

5. meaningful results because in real life 10% of failed heart
surgeries bears real life meaning to those that are considering
having heart surgery. Statistical significance is important
because it is a mathematical tool that is used to determine
whether the outcome of an experiment is the result of a
relationship between specific factors or merely the result of
chance.
Describe a Type I error for the previous study that compares
third graders’ math achievement. Describe a Type II error for
that study.
A Type II error of study could typically be presented in this
example:
Copyright © XXXX by University of Phoenix. All rights
reserved.
Copyright © 2013 by University of Phoenix. All rights reserved.
Algebra 2 Midterm Exam
Name:
_________________________
Score: ______ / ______
Answer the questions below. Make sure to show your work
when applicable

6. ___2. Find a quadratic function to model the values in the table.
Predict the value
of y for x = 6.
X y
1 2
0 2
3 -10
A. y = -2x2 + 2x -2; –58
B. y = 2x2 – 2x -2; 60
C. y = 2x2 – 2x -2; 58
D. y = -2x2 + 2x +2; –58
_____1.
Simplify.
A.

7. B.
C.
D.
Algebra 2 Midterm Exam
_____3. A manufacturer of shipping boxes has a box shaped
like a cube. The side length
is 5a + 4b. What is the volume of the box in terms of a and b?
A.
B.
C.
D.

8. ___4. If a function, f(x) is shifted to the left four units, what
function represents the
transformation?
A. f(x-4)
B. f(x) - 4
C. f(x+4)
D. f(x) + 4
5. Solve the problem by writing an inequality. A club decides to
sell T-shirts for $12 as a
fund-raiser. It costs $20 plus $8 per T-shirt to make the T-
shirts. Write and solve an
equation to find how many T-shirts the club needs to make and
sell in order to profit at
least $100.
A.
B.
C.

9. D.
Algebra 2 Midterm Exam
Short Answer: Type your answer in the space below each
question. Show your work when
applicable.
6. The velocity of sound in air is given by the equation ,
where v is the
velocity in meters per second and t is the temperature in degrees
Celsius. Find the
temperature when the velocity is 329 meters per second by
graphing the equation. Round
the answer to the nearest degree
7. The volume in cubic feet of a box can be expressed as
, or as the
product of three linear factors with integer coefficients. The
width of the box is 2 – x.
Factor the polynomial to find linear expressions for the height
and the length

10. 8. What is the solution to the equation
9. Solve the equation. Check for extraneous solutions. Type
your answers in the blanks.
x = _____ or _____
10. Write an expression for the volume of a cylinder with a
height 7in. greater than the
radius.
Algebra 2 Midterm Exam
11. What is the value of log81 3?
a. 3
b.¼
c. 4
d. 1/3

11. 12. In an experiment, a petri dish with a colony of bacteria is
exposed to cold temperatures
and then warmed again.
Time (hours) 0 1 2 3 4 5 6
Population (1000s) 5.1 3.03 1.72 1.17 1.38 2.35 4.08
a. Find a quadratic model for the data in the table. Type your
answer
below.
o
b. Use the model to estimate the population of
bacteria at 9 hours. Type your answer below.
____. 13. Evaluate the expression for the given value of the
variable(s).

12. Algebra 2 Midterm Exam
A. 32
B. 48
C. -48
D. 30
______14. Find a quadratic model for the set of values.
(–2, –20), (0, –4), (4, –20)
A. y = 4x2 + 4x + 2
B. y = 2x2 - 4x + 4
C. y = 4x2 - 2x - 4
D. y = -2x2 + 4x - 4
15. Simplify the expression. Type your answer in the blank.

13. -
16. Suppose you cut a small square from a square of fabric as
shown in the diagram. Write
an expression for the remaining shaded area. Factor the
expression. Type your answer
below.
17. Solve for x. State any restrictions on the variables.
Algebra 2 Midterm Exam
A.
B.
C.

14. D.
18. Is the relation {(3, 5), (–4, 5), (–5, 0), (1, 1), (4, 0)} a
function? Explain. Type your
answer below.
____19.
a. c.
b. d.
_____20. Consider the leading term of the polynomial function.
What is the end behavior of
the graph?
-3x5 + 9x4 + 5x3 + 3
a. The leading term is -3x5. Since n is odd and a is negative the
end behavior is up and up
b. The leading term is -3x5. Since n is odd and a is negative the
end behavior is down and
down

15. c. The leading term is -3x5. Since n is odd and a is negative the
end behavior is up and
down
d. The leading term is -3x5. Since n is odd and a is negative the
end behavior is down and
up
Algebra 2 Midterm Exam
Name: _________________________
Score: ______ / ______
Answer the questions below. Make sure to show your work
when applicable
_____1.
Simplify.
A.
B.
C.
D.

16. ___2. Find a quadratic function to model the values in the table.
Predict the value of y for x = 6.
X
y
1
2
0
2
3
-10
A. y = -2x2 + 2x -2; –58
B. y = 2x2 – 2x -2; 60
C. y = 2x2 – 2x -2; 58
D. y = -2x2 + 2x +2; –58
_____3.
A manufacturer of shipping boxes has a box shaped like a cube.
The side length is 5a + 4b. What is the volume of the box in
terms of a and b?
A.
B.
C.

17. D.
___4. If a function, f(x) is shifted to the left four units, what
function represents the transformation?
A. f(x-4)
B. f(x) - 4
C. f(x+4)
D. f(x) + 4
5. Solve the problem by writing an inequality. A club decides to
sell T-shirts for $12 as a fund-raiser. It costs $20 plus $8 per T-
shirt to make the T-shirts. Write and solve an equation to find
how many T-shirts the club needs to make and sell in order to
profit at least $100.
A.
B.
C.
D.
Short Answer: Type your answer in the space below each
question. Show your work when applicable.
6. The velocity of sound in air is given by the equation ,
where v is the velocity in meters per second and t is the
temperature in degrees Celsius. Find the temperature when the
velocity is 329 meters per second by graphing the equation.

18. Round the answer to the nearest degree
7. The volume in cubic feet of a box can be expressed as , or as
the product of three linear factors with integer coefficients. The
width of the box is 2 – x.
Factor the polynomial to find linear expressions for the height
and the length
8. What is the solution to the equation
9. Solve the equation. Check for extraneous solutions. Type
your answers in the blanks.
x = _____ or _____
10. Write an expression for the volume of a cylinder with a
height 7in. greater than the radius.
11. What is the value of log81 3?
a. 3
b.¼
c. 4
d. 1/3
12. In an experiment, a petri dish with a colony of bacteria is
exposed to cold temperatures and then warmed again.

19. Time (hours)
0
1
2
3
4
5
6
Population (1000s)
5.1
3.03
1.72
1.17
1.38
2.35
4.08
a.
Find a quadratic model for the data in the table. Type your
answer below.
·
b. Use the model to estimate the population of bacteria at 9
hours. Type your answer below.
____. 13. Evaluate the expression for the given value of the
variable(s).
A. 32

20. B. 48
C. -48
D. 30
______14. Find a quadratic model for the set of values.
(–2, –20), (0, –4), (4, –20)
A. y = 4x2 + 4x + 2
B. y = 2x2 - 4x + 4
C. y = 4x2 - 2x - 4
D. y = -2x2 + 4x - 4
15. Simplify the expression. Type your answer in the blank.
-
16. Suppose you cut a small square from a square of fabric as
shown in the diagram. Write an expression for the remaining
shaded area. Factor the expression. Type your answer below.
17. Solve for x. State any restrictions on the variables.
A.

21. B.
C.
D.
18. Is the relation {(3, 5), (–4, 5), (–5, 0), (1, 1), (4, 0)} a
function? Explain. Type your answer below.
____19.
a. c.
b. d.
_____20. Consider the leading term of the polynomial function.
What is the end behavior of the graph?
-3x5 + 9x4 + 5x3 + 3
a. The leading term is -3x5. Since n is odd and a is negative the
end behavior is up and up
b. The leading term is -3x5. Since n is odd and a is negative the
end behavior is down and down
c. The leading term is -3x5. Since n is odd and a is negative the
end behavior is up and down
d. The leading term is -3x5. Since n is odd and a is negative the
end behavior is down and up