Need help with this one
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 and Salkind. Open the data file “Mod8_SpearmanRho_Exercise File” in the Module 8 SPSS Assignments folder in Blackboard, read the following information, and 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 an APA-style Results section describing the outcome. (2 pts)
3. Answer the next two questions in “layman’s terms” as if for someone who doesn’t 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 an 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 an 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.
