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 boxplot
as 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: http://frewm.wikispaces.com/file/view/nytimes.pdf
(Data file source: 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)
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