How many hours a night do you do sleep, on average? 8.5 8 8 6 9 8.5 7 8 5 6 6 7 4.5 8 8 6 7 7 9 7 7 7 6 6 8 10 7.5 8.5 6 8 9 6 8 6 8.5 7.5 7 5 5 7 5 9 7 6 6.5 7 6 7

On average, how many hours a week do you work outside of school? 7 6 25 30 38 0 0 0 10 8 0 12 12 27.5 16 0 20 3 0 32 0 25 16 0 0 25 19.5 8.5 10 24 25 10 45 13 20 20 0 20 0 24 30 8 28 30 17 30

(1) Test for two independent means:

This is what you need to show:

1. State your research question. Explain which test applies for this question and why.

2. List and check test requirements. Provide appropriate graphs if needed [histograms for means when the sample sizes are less than 30]

3. The null and alternative hypotheses.

4. Descriptive statistics required for the test

5. Test statistic and the p-value. Do you reject or fail to reject The null hypothesis ? Why?

6. Your conclusion in terms of your research question.

7. construct corresponding 98% confidence intervals to estimate the mean difference. Do the confidence intervals confirm results you obtained from hypothesis tests? Explain.

( textual information and use a statistical package for your graphs (don't perform any calculations by hand!))