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A vending machine company must adjust its machines to accept only quarters with specified weights. a)...

A vending machine company must adjust its machines to accept only quarters with specified weights.

a) How many quarters must be tested if we want to be 99% confident that the sample mean is within 0.025 grams (g) of the true population mean for all coins used in the vending machines? Assume σ =0.068 g.

b) A random sample of 50 quarters yields a mean weight of 5.622 g and a standard deviation of 0.068 g. Based on this sample; construct a 99% confidence interval estimate of all quarters in circulation

Math   Statistics-And-Probability   
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