## (solution) PSYC 355 SPSS HOMEWORK 2 INSTRUCTIONS - INDEPENDENT SAMPLES TESTS

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PSYC 355 SPSS HOMEWORK 2 INSTRUCTIONS - INDEPENDENT SAMPLES

TESTS (40 POINTS) T Part One:

Green &amp; Salkind: Lesson 24, First Exercise

Open Lesson 24 Exercise File 1 found in Blackboard Course content (under Syllabus and

Assignment Instructions?Assignment Instructions?SPSS Homework 2?SPSS Homework 2

Files?Mod2_Lesson 24 Exercise File 1).

This data set pertains to the eating speed of different people at a McDonald?s restaurant as

described in the scenario for the first end-of-chapter exercise in Green and Salkind, Lesson 24.

Read the research scenario in the text, then follow the directions below as some questions

have been altered.

1. Paste SPSS output.

2. What are the values of t and p for ?Equal Variances Assumed??

a. What is the mean eating time for normal weight individuals?

b. What is the standard deviation for overweight individuals?

c. What is the result of Levene?s test for homogeneity of variance (F and p values)?

4. Write an APA-style Results section based on your analyses. All homework ?Results

sections? should follow the example given in the SPSS tutorials and the Course Content

document ?Writing Results of Statistical Tests in APA Format.? Remember to include a

5. Create a boxplot (not an error bar graph) to demonstrate the difference between the

groups, using the following steps (covered also in Lesson 21)

a. Go to Graphs?Legacy Dialogs?Boxplot?Select ?Simple??Select ?Summaries

for Groups of Cases?

b. Click ?Define?: Variable = ?Time Spent? (this is your dependent variable) and

Category Axis = ?Weight? (this is your independent, or grouping, variable)

c. OK

Part Two:

1. Research Scenario: An industrial/organizational psychologist is interested in studying

the effect of the type of bonus system on employee morale at a tech company. He divides

employees into two groups. One group works within a standard bonus system, with larger

one-time bonuses granted by upper management during each quarter. The other group

works within a system where upper management award smaller bonuses to workers

throughout the pay period. At the end of the pay period, the amount of bonuses in each

group is the same, with the only difference being when they were awarded. The I/O

psychologist then assesses employee morale using a 10-item scale with values ranging

from 1 (very low morale) to 50 (very high morale). Using the table below, enter the

data into a new SPSS data file and use an independent-samples t test to analyze the

claim that the two bonus payment methods result in different levels of employee

morale.

Page 1 of 3 PSYC 355 The steps of the test will be the same as the ones you have been practicing in Part One of

the assignment? the only difference is that you are now responsible for creating the data

file as well. Remember to name and define your variables under the ?Variable View,?

then return to the ?Data View? to enter and analyze the data. The table is shown on the

following page.

Group One-time large

bonus Multiple small

bonuses Employee Morale

Score

39

32

40

23

42

18

27

15

23

41

30

37

27

12

20

47 1. Paste SPSS output.

2. Create a boxplot illustrating the differences in morale between the two bonus award

methods.

3. Write an APA-style Results section based on your analyses. All homework ?Results

sections? should follow the example given in the SPSS tutorials and the Course Content

document ?Writing Results of Statistical Tests in APA Format.? Remember to include a

Part 3: Cumulative Homework: Choose the correct method from tests learned in previous

modules.

1. Research Scenario: The effects of a new faith-based anxiety treatment program are

studied in a group of elderly patients with Generalized Anxiety Disorder (GAD). One of

the outcome measures is the Geriatric Anxiety Inventory (GAI) (Pachana et al., 2007), a

measure with possible scores from 0?20, with higher scores indicating higher anxiety. A

Page 2 of 3 PSYC 355 large group of elderly patients completed the GAI before treatment. Fifteen patients with

GAI scores of 10 or higher were chosen to participate in the study. The patients

underwent the treatment program and completed the GAI at the end of treatment. The

scores are listed below. Do the elderly patients exhibit lessened anxiety, as demonstrated

by their GAI scores, after participating in the faith-based treatment program? Choose the

correct test to analyze this question, set up the SPSS file, and run the analysis.

Follow the directions under the table below.

GAI Score

Before

Treatment

15

10

14

14

12

15

16

12

9

16

17

13

12

15

16 GAI Score

After

Treatment

7

11

12

13

9

9

12

10

11

13

16

8

12

9

14 1. Paste appropriate SPSS output.

2. Paste appropriate SPSS graph.

3. Write an APA-style Results section based on your analyses. All homework ?Results

sections? should follow the example given in the SPSS tutorials. Remember to include a

Submit this assignment by 11:59 p.m. (ET) on Monday of Module/Week 2. Page 3 of 3

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