Calculate the 95% confidence interval for a sample of N = 29 with a mean 
= 52.49 and standard deviation (s) = 11.58.
a. 95% CI = 52.49 ± 4.40
b. 95% CI = 52.49 ± 3.66
c. 95% CI = 52.49 ± 5.94
d. 95% CI = 52.49 ± 4.20
a. 95% CI = 52.49 ± 4.40
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