8a) " Based on the following table, which groups are significantly different from each other using the Bonferroni test and a significance level of 0.05?

8b) Con sider respondents' average income (variable rincdol).

1. Use the Means procedure to calculate average income for different educational levels (variable degree). What is the average income for all respondents? For people with less than a high school degree? For people with a graduate degree?
2. Test the null hypothesis that the average income is the same for all degree groups.
   What assumptions do you have to make?
3. Using the Bonferroni multiple comparison procedure, determine which groups are significantly different from one another. Summarize your findings.
4. 
   Does staying in school payoff?

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