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A sample of n = 5 scores has a mean of M = 45 and a...

A sample of n = 5 scores has a mean of M = 45 and a variance of s2 = 20. Using this sample, the 90% confidence interval for the population mean is

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Answer #1

Given that,  

The 90% confidence interval is given by,

where,

(from t-table)

the 90% confidence interval for the population mean is,

The 90% confidence interval for the population mean is (40.74, 49.26).

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