Use the formula 
, where 
= to calculate the 99% confidence interval for a sample of N = 15 with a mean 
= 7.50 and standard deviation (s) = 1.25.
a. 99% CI = 7.50 ± .69
b. 99% CI = 7.50 ± .56
c. 99% CI = 7.50 ± .95
d. 99% CI = 7.50 ± 3.30
c. 99% CI = 7.50 ± .95
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