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A simple random sample of 50 items from a population with $\sigma=6$ resulted in a sample mean of 32 a. Provide a $90 \%$ confidence interval for the population mean. b. Provide a $95 \%$ confidence interval for the population mean. c. Provide a $99 \%$ confidence interval for the population mean.

Statistics for Business and Economics

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Sheryl Ezze verified

Numerade educator

An industry expert claimed that sporting goods stores average sales of $260 a square foot. A hypothesis test was requested to determine if the data supported the statement made by the expert using an a = 0.05 and a sample size of 41. Calculate the probability that the data will indicate that sporting goods stores do average sales of $260 per square foot when the true average is $300 per square foot. Assume a population standard deviation of 100. The file called Apparel contains data for a random sample of several competitors’ sales per square foot. Use a = 0.05.

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