A company manufactures tennis balls. When its tennis balls are dropped onto a co

Question

A company manufactures tennis balls. When its tennis balls are dropped onto a concrete surface from a height of 100 incl company wants the mean height the balls bounce upward to be 55.1 inches. This average is maintained by periodically testing random samples of 25 tennis balls. If the t-value falls between -095 and 1oss, manufacturing acceptable tennis balls. A sample of 25 balls is randomly selected and tested. The mean bounce is 56.3 inches and the standard deviation is 0.25 inch. Assume the bounce heights are approximately company making acceptable tennis balls? then the company will be satisfied that it is height of the sample normally distributed. Is the Find -to95 and to.95- 95 (Round to three decimal places as needed)

Explanation / Answer

Two tailed test one population mean

n = 25

Df = n - 1 = 24 , alpha = 0.05

- t 0.95 = - 2.0639

t 0.95 =  + 2.0639

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