Calculate the 95% confidence interval for a sample with a mean 
= 117.52 and a population standard error of the mean 
= 5.57.
a. 95% CI = 117.52 ± 10.92
b. 95% CI = 117.52 ± 9.19
c. 95% CI = 117.52 ± 14.37
d. 95% CI = 117.52 ± 7.53
a. 95% CI = 117.52 ± 10.92
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