Discussion Thread: Comparing Groups

In the thread for each short-answer discussion, the student will post short answers to the prompted questions.  The answers must demonstrate course-related knowledge and support their assertions with scholarly citations in the latest APA format.  The minimum word count for all short answers cumulatively is 200 words.

For each thread the student must include a title block with your name, class title, date, and the discussion forum number; write the question number and the question title as a level one heading (e.g. D1.1 Variables) and then provide your response; use Level Two headings for multi-part questions (e.g. D1.1 & D1.1.a, D1.1.b, etc.), and include a reference section.

Respond to the following short answer questions from Chapter 9 of the Morgan, Leech, Gloeckner, & Barrett textbook:

D7.9.1 (a) Under what conditions would you use a one-sample t test? (b) Provide another possible example of its use from the HSB data.

D7.9.2 In Output 9.2: (a) Are the variances equal or significantly different for the three dependent variables? (b) List the appropriate t, df, and p (significance level) for each t test as you would in an article. (c) Which t tests are statistically significant? (d) Write sentences interpreting the academic track difference between the means of grades in high school and also visualization. (e) Interpret the 95% confidence interval for these two variables. (f) Comment on the effect sizes.

D7.9.3 (a) Compare the results of Outputs 9.2 and 9.3. (b) When would you use the Mann–Whitney U test?

D7.9.4 In Output 9.4: (a) What does the paired samples correlation for mother’s and father’s education mean? (b) Interpret/explain the results for the t test. (c) Explain how the correlation and the t test differ in what information they provide. (d) Describe the results if the r was .90 and the t was zero. (e) What if r was zero and t was 5.0?

D7.9.5 (a) Compare the results of Output 9.4 with Output 9.5. (b) When would you use the Wilcoxon test?

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