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Homogeneity of variance

Question Description

Exercise 33

1. Do the data meet criteria for homogeneity of variance? Provide a rationale for your answer.

2. If calculating by hand, draw the frequency distribution of the dependent variable, hours worked

at a job. What is the shape of the distribution? If using SPSS, what is the result of the Shapiro-

Wilk test of normality for the dependent variable?

3. What are the means for three groups ’ hours worked on a job?

4. What are the F value and the group and error df for this set of data?

5. Is the F significant at α = 0.05? Specify how you arrived at your answer.

6. If using SPSS, what is the exact likelihood of obtaining an F value at least as extreme as or as

close to the one that was actually observed, assuming that the null hypothesis is true?

7. Which group worked the most weekly job hours post-treatment? Provide a rationale for your


8. Write your interpretation of the results as you would in an APA-formatted journal.

9. Is there a difference in your final interpretation when comparing the results of the LSD post hoc

test versus Tukey HSD test? Provide a rationale for your answer.

10. If the researcher decided to combine the two Treatment as Usual groups to represent an overall

“Control” group, then there would be two groups to compare: Supported Employment versus

Control. What would be the appropriate statistic to address the difference in hours worked

between the two groups? Provide a rationale for your answer.

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