Question: The formula used to compute a confidence interval for the mean of a normal population when n is small is (t critical value)

The formula used to compute a confidence interval for the mean of a normal population when n is small is
± (t critical value) s/√n
What is the appropriate t critical value for each of the following confidence levels and sample sizes?
a. 95% confidence, n = 15
b. 99% confidence, n = 20
c. 90% confidence, n = 26

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