Use the formula 
to calculate the 95% confidence interval for a sample of N = 12 with a mean 
= 6.00 and standard error of the mean 
= 1.15.
a. 95% CI = 6.00 ± 2.53
b. 95% CI = 6.00 ± 2.07
c. 95% CI = 6.00 ± 3.57
d. 95% CI = 6.00 ± 3.35
a. 95% CI = 6.00 ± 2.53
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