Calculate the 95% confidence interval for a sample of N = 25 with a mean 
= 4.06 and standard error of the mean 
= .27.
a. 95% CI = 4.06 ± .56
b. 95% CI = 4.06 ± .46
c. 95% CI = 4.06 ± .76
d. 95% CI = 4.06 ± 2.33
a. 95% CI = 4.06 ± .56
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