Here Is the week 7 work as requested I only have one week left
Confidence Intervals, Effect Size, and Statistical Power
When submitting this file, be sure the filename includes your full name, course and section.
Be sure you have reviewed this module/week?s lesson and presentations along with the practice
data analysis before proceeding to the homework exercises. Complete all analyses in SPSS, then
copy and paste your output and graphs into your homework document file. Answer any written
questions (such as the text-based questions or the APA Participants section) in the appropriate
place within the same file.
Part I: Concepts
These questions are based on the Nolan and Heinzen reading and
Part I: Questions 1a-1e
Fill in the highlighted blanks with the best word or words.
The confidence interval is centered around the ________ of the sample.
Cohen's d measures the difference between means in terms of ________.
According to Cohen's conventions, a d value of ________ indicates a small
A study that calculates the mean effect size from the individual effect sizes of
many studies is called a(n) ________.
Statistical power refers to the probability of successfully rejecting the ________.
Part I: Questions 2-5
Complete the following problems.
Page 1 of 5
If applicable, remember to show work in your homework document to receive partial
List five factors that affect statistical power. For each, indicate how a
researcher can leverage/manipulate that factor to increase power in a study.
Exercise 8.22 from N&H text: In 2006, approximately 47% of Americans,
when surveyed by a Gallup poll, felt that having a gun in the home made
them safer than having no gun. The margin of error reported was 3%.
Construct an interval estimate using these figures.
For each of the following confidence levels, look up the critical z values for a
4a) 80% (Hint: 10% in
each tail): Answer
4b) 88% Answer
Remembering that a meta-analysis calculates one mean
effect size using the effect sizes of several studies, assume
you are conducting a meta-analysis over a set of five studies.
The effect sizes for each study are: d= .80, d = .09, d = .46, d
= .65, d = .28
5b) Use Cohen?s conventions to describe the mean effect size you calculated in part (a).
Page 2 of 5
Part I: Questions 6-8
Compute effect size in the following questions:
A company decides to add a new program that prepares randomly selected sales
personnel to increase their number of sales per month. The mean number of sales per
month for the overall population of sales personnel at this national company is 25 with a
standard deviation of 3. The mean number of sales per month for those who participated
in the new program is 30.
Compute the effect size of the new sales program.
On a certain anxiety questionnaire, the general population is known to have a mean of 16
and a standard deviation of 2.4. A higher score represents higher levels of anxiety.
Participants in a new relaxation program complete the questionnaire after completing the
program and have a mean score of 12.5.
What is the effect size of the relaxation program?
A residential treatment facility tests a new group therapy for patients with selfdestructive behaviors. The therapists hope to decrease scores on a measure of selfdestructive behaviors that has a mean in the overall residential treatment population of 15
and a standard deviation of 1.6. The mean score for the patients after the new group
therapy is 13.7.
What is the effect size of the new group therapy?
Part II & Part III
There is no new SPSS material this module/week. No questions for
Part II or III
Part IV: Cumulative
Data provided below for respective questions.
Page 3 of 5
A test designed to measure helping behavior was administered to 20 university students.
The data from this test are shown in the column to the left.
(higher scores more helping).
Enter the Helping Behaviors data into a new SPSS file.
Using SPSS, calculate descriptive statistics for this variable. Be sure to include the mean
and standard deviation.
Answer: Descriptive Statistics Table
Create the appropriate graph in SPSS for the variable ?Helping Behaviors.?
Justify your choice of graph.
Answer: Appropriate graph
Using the mean and standard deviation of the helping behaviors data above (from your
SPSS output), calculate (by hand) the raw score that marks the 45th percentile of this data
set. (See last week?s material for review.)
Using the mean and standard deviation of the helping behaviors data above, calculate the
percentile of a raw score of 37. (See last week?s material for review.)
Page 4 of 5
For the following scores, state the: a) mean; b) median; c) mode; d) range; e) standard
39 35 43 27 35
Standard Deviation (Note: Compute by hand using the formula from Module 3.
5-e) Programs like SPSS or Excel use a slightly different formula that we won?t use
until Module 8 and will give you the wrong answer for this section.)
Submit Homework 7 by 11:59 p.m. (ET) on Monday of Module/Week 7. Remember to name file
Page 5 of 5
This question was answered on: Dec 18, 2020
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