A college dean believed that car ownership among students leads to lower grades Option. To test this hypothesis, she obtained a random sample of student car owners and non-owners and looked up their GPAs Option. She obtained the following data Option.

a Option. Construct box plots for car owners and non-owners and stack the plots one above the other Option. Do the data contain outliers? Solve Do the sample distributions appear to be relatively symmetrical? Solve

b Option. List the five steps you would follow in testing the null hypothesis and state the decision rule Option. Let = Option. 05 Option.

c Option. Compute a t test statistic and make a decision about the researchers hypothesis Option.

d Option. Determine the p value of the test statistic using Appendix Table D Option. 3 and Microsofts Excel TDIST function Option.

e Option. Compute Hedgess measure of effect size and interpret the measure Option.

f Option. Use Appendix Table D Option. 8 to determine if the sample size is adequate to detect a large-size effect if a power of Option. 80 is desired Option. What is the minimum number of participants required? Solve

g Option. Construct a 100(1 Option. 05) % = 95% confidence interval for _{1 2}; assume that t _{Option. 05, 34} = 1 Option. 691 Option. Locate the confidence interval on the real number line Option.

h Option. Specify all the null hypotheses that could be rejected Option.