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A researcher wants to know how many security cameras are on average in stores located in...

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Statistics

A researcher wants to know how many security cameras are onaverage in stores located in a large shopping mall. He randomlyselects a sample of 9 stores and finds that on average there are2.7 security cameras per store with a standard deviation equal to1.27.

a. Calculate and interpret the 95% confidence interval for theaverage number of security cameras per store

b. Test the hypothesis that the mean number of cameras per storeis 4 at p = 05, 2-tail test. Justify your statisticalconclusion.

c. Calculate and interpret the 90% confidence interval for theaverage number of security cameras per store

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