In an example we sometimes use in our statistics classes, several semesters€™ worth of male and female students were asked how long, in minutes, they spend getting ready for a date. The data reported below reflect the actual means and the approximate standard deviations for the actual data from 142 students.

a. Conduct all six steps of an independent-samples t test. Be sure to label all six steps.

b. Report the statistics as you would in a journal article.

c. Calculate the 95% confidence interval.

d. Calculate the 90% confidence interval.

e. How are the confidence intervals different from each other? Explain why they are different.

f. Calculate the appropriate measure of effect size.

g. Based on Cohen€™s conventions, is this a small, medium, or large effect size?

h. Why is it useful to have this information in addition to the results of a hypothesis test?

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Men: 28, 35, 52, 14 Women: 30, 82, 53, 61