Calculate the 95% confidence interval for a sample of N = 30 with a mean 
= 249.60 and a population standard deviation (?) = 50.00.
a. 95% CI = 249.60 ± 23.56
b. 95% CI = 249.60 ± 15.06
c. 95% CI = 249.60 ± 17.89
d. 95% CI = 249.60 ± 11.09
c. 95% CI = 249.60 ± 17.89
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