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Here Is the week 7 work as requested I only have one week left


PSYC 354

 


 

HOMEWORK 7

 

Confidence Intervals, Effect Size, and Statistical Power

 

When submitting this file, be sure the filename includes your full name, course and section.

 

Example: HW7_JohnDoe_354B01

 

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.

 


 

Questions 1?8

 


 

Part I: Concepts

 


 

These questions are based on the Nolan and Heinzen reading and

 

end-of-chapter questions.

 


 

Part I: Questions 1a-1e

 

Fill in the highlighted blanks with the best word or words.

 


 

1-a)

 


 

The confidence interval is centered around the ________ of the sample.

 


 

1-b)

 


 

Cohen's d measures the difference between means in terms of ________.

 


 

1-c)

 


 

According to Cohen's conventions, a d value of ________ indicates a small

 

effect.

 


 

1-d)

 


 

A study that calculates the mean effect size from the individual effect sizes of

 

many studies is called a(n) ________.

 


 

1-e)

 


 

Statistical power refers to the probability of successfully rejecting the ________.

 


 

Part I: Questions 2-5

 

End-of-chapter problems:

 

Complete the following problems.

 


 

Page 1 of 5

 


 

PSYC 354

 


 

If applicable, remember to show work in your homework document to receive partial

 

credit.

 


 

2)

 


 

List five factors that affect statistical power. For each, indicate how a

 

researcher can leverage/manipulate that factor to increase power in a study.

 


 

A)

 

B)

 

C)

 

D)

 

E)

 


 

3)

 


 

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.

 


 

Answer

 


 

4)

 


 

For each of the following confidence levels, look up the critical z values for a

 

two-tailed test.

 


 

4a) 80% (Hint: 10% in

 

each tail): Answer

 


 

Work:

 


 

4b) 88% Answer

 


 

Work:

 


 

5)

 


 

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

 


 

5a)

 

Calculat

 

e the

 

mean

 

effect

 

size of

 

these

 

studies.

 

Answer

 

5b) Use Cohen?s conventions to describe the mean effect size you calculated in part (a).

 

Answer

 


 

Page 2 of 5

 


 

PSYC 354

 


 

Part I: Questions 6-8

 

Compute effect size in the following questions:

 


 

6

 

)

 


 

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.

 


 

Answer

 


 

7

 

)

 


 

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?

 


 

Answer

 


 

8

 

)

 


 

Work:

 


 

Work:

 


 

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?

 


 

Answer

 


 

Work:

 


 

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

 


 

PSYC 354

 


 

Helping

 

Behaviors

 

47

 

56

 

52

 

39

 

40

 

63

 

39

 

45

 

50

 

46

 

32

 

54

 

47

 

35

 

65

 

61

 

43

 

56

 

59

 

52

 


 

Part IV:

 

Questions 1-4

 

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.

 


 

1-a)

 

Using SPSS, calculate descriptive statistics for this variable. Be sure to include the mean

 

and standard deviation.

 

Answer: Descriptive Statistics Table

 


 

2)

 

Create the appropriate graph in SPSS for the variable ?Helping Behaviors.?

 

Justify your choice of graph.

 

Answer: Appropriate graph

 

Justification

 


 

3)

 

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.)

 

Answer

 

Work:

 


 

4)

 

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.)

 

Answer

 

Work:

 


 

Page 4 of 5

 


 

PSYC 354

 


 

Part IV:

 

Question 5a-5e

 

For the following scores, state the: a) mean; b) median; c) mode; d) range; e) standard

 

deviation.

 

39 35 43 27 35

 


 

5-a) Mean

 

Answer

 


 

Work:

 


 

5-b) Median

 

Answer

 


 

Work:

 


 

5-c) Mode

 

Answer

 


 

Work:

 


 

5-d) Range

 

Answer

 


 

Work:

 


 

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.)

 


 

Answer

 


 

Work:

 


 

Submit Homework 7 by 11:59 p.m. (ET) on Monday of Module/Week 7. Remember to name file

 

appropriately.

 


 

Done!

 


 

Page 5 of 5

 


 

 


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