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Question: a a researcher for a state government department wants to...

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a)              A researcher for a state government department wants to study various characteristics of retail stores in the state. A random sample of 20 retail stores was taken with the average floor space was found to be 8000 m2 with a standard deviation of 600 m2. Construct a 99% confidence interval estimate of the population mean floor space of retail stores.

 

 

b) The researcher took another survey. This time he took a sample of 70 retail stores and found 21 sell Women’s fashion. Construct a 95% confidence interval estimate of the population proportion of retail stores which sell Women’s fashion.

 

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