Use the formula to calculate the lower and upper limits of the 99% confidence interval for a sample of N = 15 with a mean = 7.50 and standard error of the mean = .32.

a. (6.81, 8.19)
b. (6.94, 8.06)
c. (6.55, 8.45)
d. (4.20, 10.80)


c. (6.55, 8.45)

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