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PSY 315 Entire Course
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PSY 315 Week 3 Inferential Research and Statistics Project Part 1
Presentation
PSY 315 Week 3 Practice Problem Worksheet (Version 7)
(PTSD)
(PTSD)
Presentation (PTSD)
PSY 315 Week 2 Practice Worksheet (New, 2018)
PSY 315 Week 1 Discussion Question 1
PSY 315 week 1 Individual Assignment Research, Statistics, and
Psychology Paper
PSY 315 Week 1 Practice Problems Worksheet

PSY 315 week 2 Individual Assignment Ch 1 Practice Problems 12 15
19 20 21 and 22
PSY 315 week 2 Learning team assignment Descriptive and Inferential
Statistics Paper andTeam Charter
PSY 315 week 2 Learning team assignment Descriptive and Inferential
Statistics Presentation (New)
PSY 315 Week 3 Team Assignment Hypothesis Testing Lesson
Presentation
PSY 315 week 3 individual assignment Chapter 2 Practice Problems 11
12 13 16 21 and Chapter 3 Practice Problems 14 15 22 25
PSY 315 week 4 individual assignment Chapter 4 Practice Problems 13
16 and 20
PSY 315 week 4 Learning team assignment Hypothesis Testing Paper
on Psycological reason for Depression
PSY 315 Week 4 Team Assignment Research Data Critique

PSY 315 week 5 Individual Assignment Ch 7 Practice Problem 14, Ch 8
Practice Problem 18, Ch 9 Practice Problem 17 Ch 11 Practice Problems
11,12
PSY 315 Week 5 Individual Assignment Hypothesis Testing Paper
PSY 315 Week 5 Practice Problem Worksheet (NEW)
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What are the differences between quantitative and qualitative
data? What are some examples of each?
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What are descriptive statistics, and how might you use
descriptive statistics in your personal life?
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PSY 315 Week 1 Individual Assignment Research, Statistics, And
Psychology Paper
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Individual Assignment: Research, Statistics, and Psychology
Paper
Resources: Assigned readings, ERRs, the Internet, and other
sources
Prepare a 700- to 1,050-word paper in which you examine the
role of research and statistics in the field of psychology.
Address the following items thoroughly:
Define research and the scientific method (include an
explanation of all five steps).
Compare and contrast the characteristics of primary and
secondary data.

Explain the role of statistics in research. (Keep the focus within
the field of psychology).
Format your paper according to APA standards.
Complete the Certificate of Originality Report and submit to the
Assignments link as an attachment along with this assignment.
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Provide a response to the following questions. Written responses
should be at least 30 to 45 words each.
1. Explain and provide an example for each of the
following types of variables:
a. Nominal:

b. Ordinal:
c. Interval:
d. Ratio scale:
e. Continuous:
f. Discrete:
g. Quantitative:
h. Qualitative:
2. The following are the speeds of 40 cars clocked by radar
on a particular road in a 35 miles-per-hour zone on an afternoon:
30, 36, 42, 36, 30, 52, 36, 34, 36, 33, 30, 32, 35, 32, 37, 34, 36,
31, 35, 20

24, 46, 23, 31, 32, 45, 34, 37, 28, 40, 34, 38, 40, 52, 31, 33, 15,
27, 36, 40
Create a frequency table and a histogram. Then, describe the
general shape of the distribution.
3. Raskauskas and Stoltz (2007) asked a group of 84
adolescents about their involvement in traditional and electronic
bullying. The researchers defined electronic bullying as “…a
means of bullying in which peers use electronics (such as text
messages, emails, and defaming Web sites) to taunt, threaten,
harass, and/or intimidate a peer” (p. 565). The table below is a
frequency table showing the adolescents’ reported incidence of
being victims or perpetrators of traditional and electronic
bullying.
a. Using the table below as an example, explain the idea of
a frequency table to a person who has never taken a course in
statistics.
b. Explain the general meaning of the pattern of results.

4. Describe whether each of the following data words best
describes descriptive statistics or inferential statistics. Explain
your reasoning.
a. Describe:
b. Infer:
c. Summarize:
5. Compare the three types of research methods and
statistics.
6. Regarding gun ownership in the United States, data from
Gallup polls over a 40-year period show how gun ownership in
the United States has changed. The results are described below,
with the percentage of Americans who own guns given in each
of the 5 decades.

a. Are the percentages reported above an example of
descriptive statistics or inferential statistics? Why?
b. Based on the table, how would you describe the changes
in gun ownership in the United States over the 40 years shown?
7. Refer to the Simpson-Southward et al. (2016) article
from this week’s electronic readings. Was this an example of
inferential statistics and research or descriptive statistics and
research? Justify your response.
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The median home price in your area has increased in the last 10
years, how does this differ from the mean home price in your
area? How does this illustrate what the mean and median are?
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How effective are the pie charts that often accompany a
newspaper article in explaining the statistics being used in the
article? Can you find an example of a pie chart?
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PSY 315 Week 2 Learning Team Assignment Descriptive And
Inferential Statistics Paper AndTeam Charter
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Learning Team Assignment:Descriptive and Inferential
Statistics Paper & Team Charter: see Rubric in the Course
MaterialsForum, Also post the team charter to the Assignments
section with the completed assignment.

sources
Prepare a 700- to 1,050-word paper in which you examine the
differences between descriptive and inferential statistics.
Address the following items:
Describe the functions of statistics.
Define descriptive and inferential statistics.
Provideat least one example of the relationship between
descriptive and inferential statistics.
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PSY 315 Week 2 Learning team assignment Descriptive and
Inferential Statistics Presentation (New)
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Resource: Assigned journal article
Create a 7- to 10-slide presentation with speaker notes
examining the differences between descriptive and inferential
statistics used in the journal article you were assigned.
Address the following items as they apply to the article:
Describe the functions of statistics.
Define descriptive and inferential statistics.
Provide at least one example of the relationship between
descriptive and inferential statistics.
Format your presentation consistent with APA guidelines.
Click the Assignment Files tab to submit your assignment.
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Week 2 Practice Worksheet
Provide a response to the following prompts.
1. The Wilcox &Keselman (2003) article from this week’s electronic
readings discusses two problems with measures of central
tendency: skewness of the data and outliers. Discuss each of these
issues and how they affect measures of central tendency.
How do the sample mean and the population mean differ? What is the
symbol for each type of mean?
An expert reviews a sample of 10 scientific articles (n = 10) and records
the following numbers of error in each article: 0, 4, 2, 8, 2, 3, 1, 0, 5, and
7.
1. Compute the mean, median, mode, sum of squares (SS), the
variance, and the standard deviation for this sample using the
definitional and computational formulas. You may use
Microsoft® Excel® data anlysis to compute these statistics
and copy your output into this worksheet.
Explain, to a person who has never had a course in statistics what you
have done.
Note the ways in which the means and standard deviations differ, and
speculate on the possible meaning of these differences, presuming they

are representative of U.S. governors and large corporations’ CEOs in
general.
A researcher records the levels of attraction for various fashion models
among college students. He finds that mean levels of attraction are much
higher than the median and the mode for these data.
5. What is the shape of the distribution for the data in this study?
What measure of central tendency is most appropriate for describing
these data? Why?
On a standard measure of hearing ability, the mean is 300, and the
standard deviation is 20. Provide the Z scores for persons whose raw
scores are 340, 310, and 260. Provide the raw scores for persons
whose Z scores on this test are 2.4, 1.5, and -4.5.
6. Using the unit normal table, find the proportion under the standard
normal curve that lies in the tail for each of the follow useing table
starting on page 673 (Hint: Remember to change all percents to
decimals):
1. Z = 1.00
2. Z = -1.05
3. Z = 0
4. Z = 2.80
5. Z = 1.96
Suppose the scores of architects on a particular creativity test are
normally distributed. Using a normal curve table (pp. 673-676 of the
text), what percentage of architects have Z scores
8. above .10?
9. below .10?

10. above .20?
11. below .20?
12. above 1.10?
13. below 1.10?
A statistics instructor wants to measure the effectiveness of his teaching
skills in a class of 102 students (N = 102). He selects students by waiting
at the door to the classroom prior to his lecture and pulling aside every
third student to give him or her a questionnaire.
1. Is this sample design an example of random sampling? Explain.
Assuming that all students attend his class that day, how many students
will the instructor select to complete his questionnaire?
Suppose you were going to conduct a survey of visitors to your campus.
You want the survey to be as representative as possible.
1. How would you select the people to survey?
1. Why would that be your best method?
10. In a school band, 9 kids play string instruments, 10 kids play
woodwind instruments, 7 kids play brass instruments, and 4 kids
play percussion instruments.

1. What is the probability that you randomly select a kid who
plays a string or percussion instrument?
1. What is the probability that you randomly select a kid who does
not play a brass instrument?
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What are some terms related to hypothesis testing with which
you are already familiar? What are the five steps of hypothesis
testing? Why do the null and alternative hypotheses have to be
mutually exclusive?
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What is the difference between null and alternative hypotheses
statements in one-tailed and two-tailed tests? What are
significance/alpha levels and how does using a one versus a two
tailed test affect significance levels?
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PSY 315 Week 3 Inferential Research and Statistics Project Part
1 (PTSD)
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Select one of the following scenarios based on your particular
field of interest in psychology:
Industrial/Organizational Psychology:

A few months ago, the upper management at a large corporation
decided they wanted to make major changes in the organization.
Leadership is concerned that employees may be resistant to the
change, and they want to find out if there is a change
management method that would help employees accept change
more effectively and keep employee satisfaction high. Two
methods they have considered are the ADKAR Framework and
the Prosci Change Management Methodology. The company
wants to implement a small change in two departments before
they make any major organization changes and would like to test
the methods. The corporation uses the Devine Company to
measure employee satisfaction with an anonymous survey.
Applied Psychology:
A large medical facility is experiencing too many missed
appointments in its primary and specialty care clinics. The
facility has noticed that not all patients respond well to reminder
calls regarding follow-up appointments. Some patients do not
answer calls and do not seem to respond to voice mail
requesting they call the facility. The result is that many follow
up appointments are missed. Management has read articles that
people respond very well to text messages and would like to see
which method provides the least amount of missed

appointments. Missed appointments are tracked in the facility
database on a monthly basis.
General Psychology:
Clinicians at a small clinic have been introduced to a new
method to treat post-traumatic stress disorder (PTSD) in their
clients for veterans. Research indicates that virtual reality (VR)
is a highly effective treatment option for patients with PTSD.
Currently, the clinic uses only cognitive processing therapy
(CPT) with their patients suffering from PTSD. The clinicians
would like to find out whether VR therapy has different results
from CPT therapy. The measure used by the clinic to measure
PTSD symptoms is the Combat Exposure Scale. Both therapies
need to be applied for a minimum of 12 weeks to be effective.
Write a 525- to 750-word paper that addresses the following for
your chosen scenario:
Clearly define the problem or issue you are addressing. Provide
a brief background of any research you have found that might
affect your research hypothesis.

Create a research hypothesis based on the information provided
in each scenario. You will be given a data set with two sets of
interval data (just the numbers, as you must decide what they
represent, such as method A results or method B results). This
means you are going to test one thing against another, such as
which method works best (step 1 of the steps to hypothesis
testing). State the null and research hypotheses. Explain whether
these hypotheses require a one-tailed test or two-tailed test, and
explain your rationale.
Describe the sample you will use. Sample size will be 30 for
each group, which will be provided in your data set. Explain
what type of sampling you selected. You may create your own
data set if you want, as it is only hypothetical—you do not need
to collect any data.
Do you think you would also collect some descriptive data, such
as gender, age, or shift? Why do you think it makes sense to
collect descriptive data?
Format your paper according to APA guidelines.
Example

You have a hypothesis that two drugs have different effects on
lowering anxiety. You would have anxiety scores for drug A and
anxiety scores for drug B (all after 4 weeks of treatment) to run
inferential analysis after 4 weeks.
Null hypothesis is H0: drug A = drug B
Research hypothesis is H1: drug A ≠ drug B
Dependent variable: Anxiety score changed after treatment.
Independent variable: drug treatment
Because you did not state a direction in your hypotheses (better
than or worse than), this will be a two-tailed test. You are
looking for differences in either direction. You would set your
alpha level of .05 and have a sample for each group of 30 people
that were volunteers for the study.
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1. On a standard measure of hearing ability, the mean is 300,
and the standard deviation is 20. Provide the Z scores for
persons whose raw scores are 340, 310, and 260. Provide the
raw scores for persons whose Z scores on this test are 2.4, 1.5,
and -4.5.
2. Using the unit normal table, find the proportion under the
standard normal curve that lies to the right of each of the
following:
a. z = 1.00
b. z = -1.05
c. z = 0
d. z = 2.80
e. z = 1.96
3. Suppose the scores of architects on a particular creativity
test are normally distributed. Using a normal curve table (pp.
477–480 of the text), what percentage of architects have Z
scores
a. Above .10?

b. Below .10?
c. Above .20?
d. Below .20?
e. Above 1.10?
f. Below 1.10?
g. Above -.10?
h. Below -.10?
4. A statistics instructor wants to measure the effectiveness of
his teaching skills in a class of 102 students (N = 102). He
selects students by waiting at the door to the classroom prior to
his lecture and pulling aside every third student to give him or
her a questionnaire.
Is this sample design an example of random sampling? Explain.
Assuming that all students attend his class that day, how many
students will the instructor select to complete his questionnaire?

5. Suppose you were going to conduct a survey of visitors to
your campus. You want the survey to be as representative as
possible.
a. How would you select the people to survey?
b. Why would that be your best method?tudy.
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Week 3 Practice Worksheet
Provide a response to the following prompts.
Note: Each team member should compute the following questions and
submit them to the Learning Team forum. The team should then discuss
each team member’s answers to ascertain the correct answer for each
question. Once your team has answered all the questions, submit a
finalized team worksheet.

1. When a result is not extreme enough to reject the null hypothesis,
explain why it is wrong to conclude that your result supports the
null hypothesis.
List the five steps of hypothesis testing and explain the procedure and
logic of each.
A researcher wants to know whether people who regularly listen to
radio talk shows are more or less likely to vote in national elections than
people in general.
1. State the research hypothesis and null hypothesis
Would the researchers use a one- or two-tailed Z test?
The general population (Population 2) has a mean of 30 and a standard
deviation of 5, and the cutoff Z score for significance in a study
involving one participant is 1.96. If the raw score obtained by the
participant is 45, what decisions should be made about the null and
research hypotheses?
One hundred people are included in a study in which they are compared
to a known population that has a mean of 73, a standard deviation of 20,
and a rectangular distribution.
1. μM = __________.
2. σM = __________.
3. The shape of the comparison distribution is __________.
4. If the sample mean is 75, the lower limit for the 99% confidence
interval is __________.
5. If the sample mean is 75, the upper limit for the 99% confidence
6. If the sample mean is 75, the lower limit for the 95% confidence
7. If the sample mean is 75, the upper limit for the 95% confidence

A psychology professor of a large class became curious as to whether
the students who turned in tests first scored differently from the overall
mean on the test. The overall mean score on the test was 75 with a
standard deviation of 10; the scores were approximately normally
distributed. The mean score for the first 20 students to turn in tests was
78. Using the .05 significance level, was the average test score earned by
the first 20 students to turn in their tests significantly different from the
overall mean?
1. Use the five steps of hypothesis testing.
Figure the confidence limits for the 95% confidence interval.
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PSY 315 Week 3 Team Assignment Hypothesis Testing Lesson
Presentation
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Prepare a 7- to 10-slide Microsoft PowerPoint Presentation with
speaker notes, as a lesson to explain the null and alternative
hypothesis and how to use a z-test to test the null hypothesis.

Provide an example to illustrate your lesson.
Include a minimum of 1-2 peer-reviewed resources as
references.
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What is a t-Test? How is the t-Test different from what we
learned last week? What is the normal distribution and how does
it relate to the t-test? What is an example of a situation in which
you would use a t Test for dependent means?
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What is the theory underlying the ANOVA? Why is it
important? What are the differences between a two sample t-test
and ANOVA hypothesis testing? What is an example of a
research idea that would need to be analyzed using an ANOVA?
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2 (PTSD)
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Analyze the data from Part 1 using Microsoft® Excel®
software.
Write a 700- to 875-word paper that includes the following
information:
Describe what method you are using to compare groups.

Copy and paste the output into a Microsoft® Word document,
and also answer the following questions:
What is the significance level of the comparison?
What was the alpha level you identified in Week 3?
What was the means and variance for each variable?
What was the test statistic?
What was the critical value for both the one- and two-tailed test?
Was your test one-tailed or two-tailed?
Were you able to reject the null hypothesis? In other words, did
you prove there was a difference?
Talk about what these results mean in everyday language and in
context to your chosen scenario.
Make a recommendation based on the findings.
Format your paper according to APA guidelines.
Example of Output You Would Use to Answer These Questions
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PSY 315 Week 4 Learning Team Assignment Hypothesis Testing
Paper On Psycological Reason For Depression
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Learning Team Assignment: Hypothesis Testing Paper
sources
Select a research issue, problem, or opportunity in the field of
psychology.
Obtain instructor approval for your research issue, problem, or
opportunity before completing your Hypothesis Testing Paper.
Prepare a 1,050- to 1,750-word paper in which you formulate a
hypothesis based on your selected research issue, problem, or
opportunity. See the rubric in the Course Materials forum.

Address the following:
Describe your selected research issue, problem, or opportunity.
Formulate both a numerical and verbal hypothesis statement
concerning your selected research issue, problem, or
opportunity.
Explainhow the five steps of hypothesis testing were carried out
for analyzing your data, and how the five steps of hypothesis
testing may be used to evaluate other solutions for your selected
research issue, problem, or opportunity.
Learning Team Assignment: Hypothesis Testing Presentation
sources
Prepare a 10- to 15-slides (not including the title and reference
slides) Microsoft® PowerPoint® presentation with presenter
notes illustrating your Hypothesis Testing Paper. (Remember the
title and references slides do not count towards the needed total

slide count). Follow the rubric provided in the Course Materials
forum.
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Two boats, the Prada (Italy) and the Oracle (USA), are
competing for a spot in the upcoming America’s Cup race. They
race over a part of the course several times. The sample times in
minutes for the Prada were as follows: 12.9, 12.5, 11.0, 13.3,
11.2, 11.4, 11.6, 12.3, 14.2, and 11.3. The sample times in
minutes for the Oracle were as follows: 14.1, 14.1, 14.2, 17.4,
15.8, 16.7, 16.1, 13.3, 13.4, 13.6, 10.8, and 19.0. For data
analysis, the appropriate test is the t test: two-sample assuming
unequal variances.
The next table shows the results of this independent t test. At the
.05 significance level, can you conclude that there is a difference
in their mean times? Explain these results to a person who

knows about the t test for a single sample but who is unfamiliar
with the t test for independent means.
The Willow Run Outlet Mall has two Haggar Outlet Stores, one
located on Peach Street and the other on Plum Street. The two
stores are laid out differently, but both store managers claim
their layout maximizes the amounts customers will purchase on
impulse. A sample of 10 customers at the Peach Street store
revealed they spent the following amounts more than planned:
$17.58, $19.73, $12.61, $17.79, $16.22, $15.82, $15.40, $15.86,
$11.82, $15.85. A sample of 14 customers at the Plum Street
store revealed they spent the following amounts more than they
planned when they entered the store: $18.19, $20.22, $17.38,
$17.96, $23.92, $15.87, $16.47, $15.96, $16.79, $16.74, $21.40,
$20.57, $19.79, $14.83. For data analysis, a t test: two-sample
assuming unequal variances was used.
At the .01 significance level, is there a difference in the mean
amount purchased on an impulse at the two stores? Explain
these results to a person who knows about the t test for a single
sample but who is unfamiliar with the t test for independent
means.

Fry Brothers Heating and Air Conditioning, Inc. employs Larry
Clark and George Murnen to make service calls to repair
furnaces and air conditioning units in homes. Tom Fry, the
owner, would like to know whether there is a difference in the
mean number of service calls they make per day. Assume the
population standard deviation for Larry Clark is 1.05 calls per
day, and 1.23 calls per day for George Murnen. A random
sample of 40 days last year showed that Larry Clark made an
average of 4.77 calls per day. For a sample of 50 days, George
Murnen made an average of 5.02 calls per day. At the .05
significance level, is there a difference in the mean number of
calls per day between the two employees? What is the p-value?
Chapters 11 & 12
A consumer organization wants to know if there is a difference
in the price of a particular toy at three different types of stores.
The price of the toy was checked in a sample of five discount
toy stores, five variety stores, and five department stores. The
results are shown below.
An ANOVA was run and the results are shown below. At the
.05 significance level, is there a difference in the mean prices
between the three stores? What is the p-value? Explain why an
ANOVA was used to analyze this problem.

A physician who specializes in weight control has three different
diets she recommends. As an experiment, she randomly selected
15 patients and then assigned 5 to each diet. After three weeks
the following weight losses, in pounds, were noted. At the .05
significance level, can she conclude that there is a difference in
the mean amount of weight loss among the three diets?
An ANOVA was run and the results are shown below. At the
.01 significance level, is there a difference in the weight loss
between the three plans? What is the p-value? What can you do
to determine exactly where the difference is?
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What is a correlation? What are the different types of correlation
research? Why is it important to determine correlation? How is
the strength of a correlation determined??
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If anxiety and depression are correlated, what three possible
directions of causality might explain this correlation?
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PSY 315 Week 5 Individual Assignment Hypothesis Testing
Paper
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Resource: Instructor approved research issue, problem, or
opportunity in the field of psychology

Prepare a 1,400- to 1,750-word paper in which you formulate a
hypothesis based on your selected research issue, problem, or
opportunity.
Address the following:
Describe your selected research issue, problem, or opportunity.
Formulate a hypothesis statement concerning your selected
research issue, problem, or opportunity.
Determine your population and describe which sampling method
you would use to generate your sample
Describe how you would collect your data, the level of
measurement of your data and which statistical technique you
would use to analyze the data. Explain why you chose that
statistical technique.
Include a conclusion of your anticipated findings.
Format your paper consistent with APA guidelines.
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3 Presentation (PTSD)

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Create a 12- to 15-slide presentation using the information you gathered
and submitted in Weeks 3 & 4. Include the following:
Describe the problem, and provide some brief background about the
situation.
Explain the research hypothesis.
Describe your sample and your sampling method.
Explain the four steps of the research process you followed, and define
the critical value and the test statistic your analysis provided.
Provide the main finding of the study. What did you prove or fail to
prove?
Provide recommendations based on your findings.
Format any citations in your presentation according to APA guidelines.
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Provide a response to the following questions.
Note: Each team member should compute the following questions and
submit them to the Learning Team forum. The team should then discuss
each team member’s answers to ascertain the correct answer for each
question. Once your team has answered all the questions, submit a
finalized team worksheet.
Your research team has been tasked with finding the correlation of the
following scenario:
Four research participants take a test of manual dexterity (high scores
mean better dexterity) and an anxiety test (high scores mean more
anxiety). The scores are as follows:
Person Dexterity Anxiety
1 1 10
2 1 8
3 2 4
4 4 -2
Describe the process your research team would go through by
completing the following:
1. Create a scatter diagram of the scores, which should be a negative
direction.
2. Describe in words the general pattern of correlation, if any.
3. Figure the correlation coefficient.

4. Explain the logic of what you have done, writing as if you are
speaking to someone who has never heard of correlation (but who does
understand the mean, standard deviation, Z scores, and hypothesis
testing).
5. Provide three logically possible directions of causality, indicating
for each direction whether it is a reasonable explanation for the
correlation in light of the variables involved. Explain why.
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