In Exercises 13–16, test the claim about the population variance s2 or standard deviation s at the level of significance a. Assume the population is normally distributed. 13. Claim: s2 = 0.52; a =...

In Exercises 13–16, test the claim about the population variance s2 or standard deviation s at the level of significance a. Assume the population is normally distributed.

13. Claim: s2 = 0.52; a = 0.05. Sample statistics: s2 = 0.508, n = 18

14. Claim: s2 Ú 8.5; a = 0.05. Sample statistics: s2 = 7.45, n = 23

15. Claim: s = 24.9; a = 0.10. Sample statistics: s = 29.1, n = 51

16. Claim: s 6 40; a = 0.01. Sample statistics: s = 40.8, n = 12