Refer to Exercise 7.97. For each part, a-d, form a 90% confidence interval for σ.
In Exercise 7.97
Given the following values of x , s , and n , form a 90% confidence interval for s2 .
a. = 21, s = 2.5, n = 50
b. = 1.3, s = .02, n = 15
c. = 167, s = 31.6, n = 22
d. = 9.4, s = 1.5, n = 5