Calculate the 99% confidence interval for a sample of N = 28 with a mean 
= 13.64 and standard deviation (s) = 5.52.
a. 99% CI = 13.64 ± 2.13
b. 99% CI = 13.64 ± 1.77
c. 99% CI = 13.64 ± 2.88
d. 99% CI = 13.64 ± 3.81
c. 99% CI = 13.64 ± 2.88
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