Question

Calculate the two-sided 99% confidence interval for the population standard deviation (sigma) given that a sample of size n=15 yields a sample standard deviation of 13.48.

Your answer:
	10.56 < sigma < 2.98
	13.47 < sigma < 15.49
	6.14 < sigma < 29.86
	3.93 < sigma < 4.36
	8.61 < sigma < 30.35
	1.70 < sigma < 27.95
	13.63 < sigma < 3.80
	9.01 < sigma < 24.99
	15.68 < sigma < 30.26
	8.21 < sigma < 26.45

Answer 1

Refer chi-square table or use excel formula "=CHISQ.INV.RT(0.995,14)" & "=CHISQ.INV.RT(0.005,14)" to find the critical values.