The formula used to compute a confidence interval for the mean of a normal population is

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The formula used to compute a confidence interval for the mean of a normal population is
 ± (t critical value) s/√n
What is the appropriate t critical value for each of the following confidence levels and sample sizes?
a. 90% confidence, n = 12
b. 90% confidence, n = 25
c. 95% confidence, n = 10
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