Calculate the 95% confidence interval for a sample with a mean 
= 12.67 and a population standard error of the mean 
= .98.
a. 95% CI = 12.67 ± 1.61
b. 95% CI = 12.67 ± 1.92
c. 95% CI = 12.67 ± 2.28
d. 95% CI = 12.67 ± 2.52
b. 95% CI = 12.67 ± 1.92
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