A. For a confidence level of 90% with a sample size of 12, find the critical t value. B. You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 9. Find the critical value that corresponds to a confidence level of 80%. (Report answer accurate to three decimal places with appropriate rounding.) ta/2 = ±
Added by Melissa S.
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For a confidence level of 90% with a sample size of 12, the degrees of freedom would be 12-1 = 11. Looking up this value in a t-distribution table, the critical t value is approximately 1.796. Show more…
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