Calculate the 90% confidence interval for a sample of N = 25 with a mean 
= 2.75 and standard error of the mean 
= .19.
a. 90% CI = 2.75 ± .33
b. 90% CI = 2.75 ± .53
c. 90% CI = 2.75 ± 1.90
d. 90% CI = 2.75 ± .39
a. 90% CI = 2.75 ± .33
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