Calculate the 95% confidence interval for a sample of N = 21 with a mean 
= 73.51 and standard error of the mean 
= 2.97.
a. 95% CI = 73.51 ± 6.20
b. 95% CI = 73.51 ± 5.12
c. 95% CI = 73.51 ± 8.45
d. 95% CI = 73.51 ± 5.06
a. 95% CI = 73.51 ± 6.20
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