Calculate the 95% confidence interval for a sample with a mean 
= 2.50 and a population standard error of the mean 
= .20.
a. 95% CI = 2.50 ± .39
b. 95% CI = 2.50 ± .33
c. 95% CI = 2.50 ± .52
d. 95% CI = 2.50 ± 2.16
a. 95% CI = 2.50 ± .39
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