Fundamentals of Statistics (5th Edition)
Fundamentals of Statistics (5th Edition)
5th Edition
ISBN: 9780134508306
Author: Michael Sullivan III
Publisher: PEARSON
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Chapter B.2, Problem 9AYU

a.

To determine

To construct: A 90% confidence interval for σ2 if the sample size is n=20 .

b.

To determine

To construct: A 90% confidence interval for σ2 if the sample size is n=30 .

To find: The effect on width of confidence interval when the sample size is increased.

c.

To determine

To construct: A 98% confidence interval for σ2 if the sample size is n=20 .

To compare: The result with part (a).

To find: The effect on width of confidence interval by increasing level of significance.

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