Calculate the 95% confidence interval for a sample with a mean 
= 15.86 and a population standard error of the mean 
= 1.89.
a. 95% CI = 15.86 ± 3.70
b. 95% CI = 15.86 ± 3.12
c. 95% CI = 15.86 ± 4.88
d. 95% CI = 15.86 ± 3.85
a. 95% CI = 15.86 ± 3.70
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Fill in the blank(s) with correct word
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