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

(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 & 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??
3. Answer the following questions:
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
decision about the null hypothesis.
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
decision about the null hypothesis.
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
decision about the null hypothesis.
Submit this assignment by 11:59 p.m. (ET) on Monday of Module/Week 2. Page 3 of 3