Find the 95% confidence interval estimate for the true mean
A food snack manufacturer samples 15 bags of pretzels off the assembly line and weighed their contents. If the sample mean is 10.0 and the sample standard deviation is 0.15, find the 95% confidence interval estimate for the true mean.
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A certain airplane has two independent alternators to provide elctrical power. The probability that a given altenator will fail on a 1-hour flight is .02. What is the probability that (a) both will fail? (b) neither will fail? (c) one or the other
A previous study of nickels showed that the standard deviation of the weight of nickels is 150 milligrams. How many nickels does a coin counter manufacturer need to weigh so that she can be 98% confident that her sample mean is within 25 milligram
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