# Statistics

Tennis Ball Manufacturing: A company manufactures tennis balls. When its tennis balls are dropped onto a concrete surface from a height of 100 inches, the company wants the mean height of a ball’s bounce upward to be 55.5 inches. This average is maintained by periodically testing random samples of 25 tennis balls. If a 99% confidence level contains the desired bounce height (55.5 inches), the company will be satisfied that it is manufacturing acceptable tennis balls. A sample of 25 tennis balls is randomly selected and tested. The mean bounce height of the sample is 56 inches and the standard deviation is .25 inches. Is the company making acceptable tennis balls? Explain your reasoning.

I have listed the givens, but I'm confused as to where the book is getting the t value of 2.797. I also don't know what equation to use

1. 👍 0
2. 👎 0
3. 👁 941
1. No

1. 👍 0
2. 👎 1

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