Question: A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean isx = 850 and the sample

A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean isx

= 850 and the sample standard deviation iss= 15. UseAppendix Dto find the values of Student'st.

(a)Construct an interval estimate ofwith 95% confidence.(Round your answers to 3 decimal places.)

The 95% confidence interval is from__to __

(b)Construct an interval estimate ofwith 95% confidence, assuming thats= 30.(Round your answers to 3 decimal places.)

The 95% confidence interval is from__to__

(c)Construct an interval estimate ofwith 95% confidence, assuming thats= 60.(Round your answers to 3 decimal places.)

The 95% confidence interval is from __to __

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