1} In a random sample of nine people, the mean driving distance to

work was 25 miles standard deviation was 5 miles. use the t-distribution to find the margin

of error and construct a 98% confidence interval for the population mean. Interpret the

results.

2} Construct the indicated confidence interval for the population mean(mu)

C=90% ,=31 = 0.85, n=100

3} The undergraduate grade point averages (UGPA) of students taking

the Law School Admission Test in a recent year can be approximated by a normal

distribution,With a = 3.40 = 0.2

. (a) What is the minimum UGPA that would still place a student in the top 10% of

UGPAs?

(b) Between what two values does the middle 50% of the UGPAs lie?