Question: If a sample has 20 observations and a 90% confidence estimate for is needed, the appropriate reliability factor is: A. 2.131 B. 1.746 C. 2.120

If a sample has 20 observations and a 90% confidence estimate for is needed, the appropriate reliability factor is:

A. 2.131

B. 1.746

C. 2.120

D. 1.729

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