PSYC 355 SPSS HOMEWORK 8

SPSS Homework 8 Instructions
Nonparametric
Tests
Part
1:

1.
Green & Salkind: Lesson 42, Exercises 1, 3–4

The following
helpful tips are numbered to correspond with the exercise number to which they
refer (a dash indicates that no tips are needed):

1.
This research scenario will be
familiar to you. Do letters a, b, and c, answering the questions beneath your
SPSS output. (3 pts for output and 2 pts each for a–c)
3.
All homework “Results sections”
must follow the example given in the Course Content document “Writing Results
of Statistical Tests in Current APA Format” (Note: you do not have to refer to
a figure). (4 pts)
4.
Create a boxplotas done in earlier modules/weeks. (3 pts)

2.
Spearman Rho Exercise: This exercise is not found in Green &
Salkind. Open the data file “Mod8_SpearmanRho_Exercise File” in the Module/Week
8 SPSS Assignments folder in Blackboard and read the following information;
answer the questions below.

Scenario: During the Vietnam War, a draft was put in place that selected
young men born on certain dates and placed them in the armed services. The
process proceeded via lottery: Dates like “Sept. 14” were placed in capsules,
one for each of the 365 days of the year, and the capsules were then drawn
randomly from a container. In the 1970 draft, Sept. 14 was the first date
drawn, meaning that all young men born on Sept. 14 were eligible for the very
first round of the draft, and so on. After the results of the 1970 draft were
analyzed, many statisticians and politicians asserted that the process had not
been random at all, and certain men had a higher chance of being drafted than
others. This case is famous, making it to the pages of international newspapers
and the U.S. Supreme Court.

In the SPSS data
file in Blackboard, you will find the original 1970 draft data with two
variables. Column 1 contains the consecutive day of the year (1 = Jan. 1; 2 =
Jan. 2; and so on). Column 2 contains the draft rank (1 = first date drawn; 2 = second date drawn; and so on). So, in the first
row of the data set, Day 1 (Jan. 1) had a draft rank of 305. The lower the
draft rank, the sooner and more likely a man was to be drafted. So, a higher
rank (like 305, for example) was preferable to those who did not want to be
drafted right away.

If the process
had been statistically random, there would be no correlation between the day of
the year you were born and the rank that was assigned to you (r = 0). Any type
of significant correlation would mean that there was something relating the
variables beyond mere random error, or chance.

1.
Open the data file and perform
a Spearman correlation analysis for the day of year and the draft rank. Paste
your output in the homework document. (2 pts)
2.
Write a current APA-style results
section describing the outcome. (2 pts)
3.
Answer the next two questions in
“layman’s terms” as if for someone who does not know much about statistics: (a)
Why did people accuse the process of not being random? (b) What do the data
indicate for men born earlier in the year vs. men born later in the year? (2
pts)

It’s not required, but if you want to check
out the original New York Times article and see an interesting graph, go to
this link: .wikispaces.com/file/view/nytimes.pdf”>http://frewm.wikispaces.com/file/view/nytimes.pdf

(Data file source: .amstat.org/publications/jse/v5n2/datasets.starr.html#rosenbaum1″>http://www.amstat.org/publications/jse/v5n2/datasets.starr.html#rosenbaum1)

Part
2:

1. A university assessment department collects data to determine
whether class ranking differs between male and female students. Based on the
top 12 males and top 12 females of the senior class, is there a difference
between genders on where they are ranked in their class? Perform a Mann-Whitney
U test, being sure to follow the directions on the following page. (3 pts)

Male

Female

2
5
7
10
11
13
15
16
18
21
23
24

1
3
4
6
8
9
12
14
17
19
20
22

Note: Your file must be set up in the same manner as the example data
file and the exercise file from Part 1 with a grouping variable and a
dependent/test variable. Because these are class rankings, they are ordinal
data and must be identified as such in “Variable View” under the column
“Measure.” Click in the cell under “Measure” in the row for your class rank
variable and choose “Ordinal.” This ensures that SPSS treats the data at the
proper level of measurement.

2.
Create a boxplot depicting the
results. (3 pts)
3.
Write a current APA-style results
section describing the outcome. All homework “results sections” must follow the
example given in the Course Content document “Writing Results of Statistical
Tests in Current APA Format” (Note: you do not have to refer to a figure). (3
pts)

Part
3: Cumulative Homework

1.
An organizational psychologist
wants to find out if job satisfaction ratings differ as a function of
department (human resources, sales, and research and development) and/or time
of shift (early, late). Choose the correct test to analyze this question, set
up the SPSS file, and run the analysis. Follow the directions under the table
below.

Early shift

Human Resources

Sales

Research and Development

10
16
12
16
9

19
21
16
18

17
21
18
14

Late shift

14
13
8
12
12

17
12
14
9
10

12
15
19
14

a)
Paste appropriate SPSS output.
(3 pts)
b)
Paste appropriate SPSS graph.
(3 pts)
c)
Write a current APA-style results
section describing the outcome. All homework “results sections” must follow the
example given in the Course Content document “Writing Results of Statistical
Tests in Current APA Format” (Note: you do not have to refer to a figure). (3
pts)

Submit this assignment by 11:59 p.m. (ET)
on Friday of Module/Week 8.