Question: A random sample of 28 items is drawn from a population whose standard deviation is unknown. The sample mean isx x = 790 and the

A random sample of 28 items is drawn from a population whose standard deviation is unknown. The sample mean isx

x

= 790 and the sample standard deviation iss= 15. UseAppendix Dto find the values of Student'st.

(a)Construct an interval estimate ofwith 99% confidence.(Round your answers to 3 decimal places.)

The 99% confidence interval is from____to____

(b)Construct an interval estimate ofwith 99% confidence, assuming thats= 30.(Round your answers to 3 decimal places.)

The 99% confidence interval is from____to_____

(c)Construct an interval estimate ofwith 99% confidence, assuming thats= 60.(Round your answers to 3 decimal places.)

The 99% confidence interval is from ____to____

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