When constructing a confidence interval for a population mean μ from a sample of size 12, the number of degrees of freedom for the critical value tα/2 is ___________________________. b. Find the critical value tα/2 needed to construct a confidence interval of the given confidence level 90% with sample size 23
Added by Latasha M.
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In this case, the sample size is 12, so the degrees of freedom is \( 12 - 1 = 11 \). Show more…
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