Study Time and Score. Following are the data on total hours studied over 2 weeks and test score at the end of the 2 weeks from Exercise 15.27.

x 12 24 10 9 15 17 9 18 16 22 y 84 79 81 90 81 85 82 84 83 75

a. At the 1% significance level, do the data provide sufficient evidence to conclude that a negative linear correlation exists between study time and test score for beginning statistics students?

b. Repeat part

(a) using a 5% significance level.

Working with Large Data Sets In each of Exercises 15.134–15.144, use the technology of your choice to decide whether you can reasonably apply the correlation t-test.

If so, perform and interpret the required correlation t-test(s) at the 5% significance level.