Question: A random sample of 23 items is drawn from a population whose standard deviation is unknown. The sample mean is x x = 840 and

A random sample of 23 items is drawn from a population whose standard deviation is unknown. The sample mean is

x

x

= 840 and the sample standard deviation iss= 15. UseAppendix Dto find the values of Student'st.

(a)Construct an interval estimate ofwith 98% confidence.(Round your answers to 3 decimal places.)

The 98% confidence interval is from

to

(b)Construct an interval estimate ofwith 98% confidence, assuming thats= 30.(Round your answers to 3 decimal places.)

The 98% confidence interval is from

to

(c)Construct an interval estimate ofwith 98% confidence, assuming thats= 60.(Round your answers to 3 decimal places.)

The 98% confidence interval is from

to

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