# Question

A sample of 25 observations selected from a normally distributed population produced a sample variance of 35. Construct a confidence interval for σ2 for each of the following confidence levels and comment on what happens to the confidence interval of σ2 when the confidence level decreases.

a. 1 – α = .99

b. 1 – α = .95

c. 1 – α = .90

a. 1 – α = .99

b. 1 – α = .95

c. 1 – α = .90

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