What is the appropriate t critical value for each of the following confidence levels and sample sizes?
a. 95% confidence, n = 17
b. 90% confidence, n = 12
c. 99% confidence, n = 24
d. 90% confidence, n = 25
e. 90% confidence, n = 13
f. 95% confidence, n = 10

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社 ± (r critical value)