A researcher wants to determine whether wearing uniforms in middle school has an effect on attitudes toward the importance of getting good grades. On a national survey, the average attitude score for students who do not wear uniforms is =79. A sample of 41 students who wear uniforms had a mean score of 84 with estimated population variance of 159.20.

a) Test the researcher's hypothesis using all 6 steps of hypothesis testing. Be sure to number all 6 steps and show all of your work.

b) IF APPROPRIATE, compute the confidence interval.