Calculate the lower and upper limits of the 99% confidence interval for a sample of N = 28 with a mean 
= 13.64 and standard error of the mean 
= 1.04.
a. (11.51, 15.77)
b. (11.87, 15.4)
c. (10.76, 16.52)
d. (9.83, 17.45)
c. (10.76, 16.52)
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