Calculate the 95% confidence interval for a sample with a mean 
= 57.28 and a population standard error of the mean 
= 3.27.
a. 95% CI = 57.28 ± 6.41
b. 95% CI = 57.28 ± 5.40
c. 95% CI = 57.28 ± 8.44
d. 95% CI = 57.28 ± 5.23
a. 95% CI = 57.28 ± 6.41
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