Calculate the 95% confidence interval for a sample with a mean 
= 249.60 and a population standard error of the mean 
= 9.13.
a. 95% CI = 249.60 ± 17.89
b. 95% CI = 249.60 ± 15.06
c. 95% CI = 249.60 ± 23.56
d. 95% CI = 249.60 ± 11.09
a. 95% CI = 249.60 ± 17.89
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