Calculate the 95% confidence interval for a sample of N = 17 with a mean 
= 12.42 and a population standard deviation (?) = 5.00.
a. 95% CI = 12.42 ± 2.37
b. 95% CI = 12.42 ± 2.00
c. 95% CI = 12.42 ± 3.12
d. 95% CI = 12.42 ± 3.17
a. 95% CI = 12.42 ± 2.37
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