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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