Calculate the lower and upper limits of the 90% confidence interval for a sample of N = 17 with a mean = 18.43 and standard error of the mean = .72.

a. (17.17, 19.69)
b. (16.33, 20.53)
c. (15.96, 20.90)
d. 16.90, 19.96)


a. (17.17, 19.69)

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