Calculate the 95% confidence interval for a sample of N = 25 with a mean 
= 3.74 and a population standard deviation (?) = 6.00.
a. 95% CI = 3.74 ± 2.35
b. 95% CI = 3.74 ± 1.98
c. 95% CI = 3.74 ± 3.10
d. 95% CI = 3.74 ± 3.16
a. 95% CI = 3.74 ± 2.35
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