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Question 4 A random sample of 30 prices of afternoon tea in our Med Canteen showed a mean of $9 with a standard deviation of

Question 4

A random sample of 30 prices of afternoon tea in our Med Canteen showed a mean of $9 with a standard deviation of $4.

a) Find the 95 percent confidence interval for the mean of all afternoon tea.

b) A random sample of 30 afternoon tea showed a standard deviation of $4. Find the 90 percent confidence interval for the population standard deviation.

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