Calculate the 95% confidence interval for a sample of N = 15 with a mean 
= 3.50 and standard error of the mean 
= .21.
a. 95% CI = 3.50 ± .45
b. 95% CI = 3.50 ± .37
c. 95% CI = 3.50 ± .63
d. 95% CI = 3.50 ± 2.36
a. 95% CI = 3.50 ± .45
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