Calculate the 95% confidence interval for a sample of N = 30 with a mean 
= 7.12 and standard deviation (s) = 3.67.
a. 95% CI = 7.12 ± 1.37
b. 95% CI = 7.12 ± 1.14
c. 95% CI = 7.12 ± 1.84
d. 95% CI = 7.12 ± 2.72
a. 95% CI = 7.12 ± 1.37
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