Question: Refer to Exercise 7.97. For each part, a-d, form a 90% confidence interval for . In Exercise 7.97 Given the following values of x ,

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. x̅ = 21, s = 2.5, n = 50

b. x̅ = 1.3, s = .02, n = 15

c. x̅ = 167, s = 31.6, n = 22

d. x̅ = 9.4, s = 1.5, n = 5

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