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A random sample of 12 items is drawn from a population whose standard deviation is unknown. The sample mean isx x= 800 and the sample

A random sample of 12 items is drawn from a population whose standard deviation is unknown. The sample mean isx

x= 800 and the sample standard deviation iss= 10. UseAppendix Dto find the values of Student'st.

(a)Construct an interval estimate ofwith 95% confidence.

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