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Standard deviation of the sample

The mean and the standard deviation of the sample of 40 trash bag breaking strengths are 50.575 and 1.6438, respectively. ( 1) Test H 0 : m 50 versus H a : m 50 by setting a equal to .05 and using a critical value rule. ( 2) Interpret the ( computer calculated) p- value of .0164 for the test. That is, explain how much evidence there is that H 0 is false.

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## Q : Find the population mean

How large of a sample is needed to find the population mean within $250 at 99 percent confidence?