Question: NCAA rules require the circumference of a softball to be 12 { 0.125 inches. Suppose that the NCAA also requires that the standard deviation of

NCAA rules require the circumference of a softball to be 12 { 0.125 inches. Suppose that the NCAA also requires that the standard deviation of the softball circumferences not exceed 0.05 inch. A representative from the NCAA believes the manufacturer does not meet this requirement. She collects a random sample of 20 softballs from the production line and finds that s = 0.09 inch. Is there enough evidence to support the representative's belief at the a = 0.05 level of significance?

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