Question: Given M 1 = 13, M 2 = 18, s M1M2 = 1.48, and t cv = 2.015, (a) Calculate the 95% confidence interval for

Given M1 = −13, M2 = −18, sM1−M2 = 1.48, and tcv = 2.015,

(a) Calculate the 95% confidence interval for the difference between population means, and

(b) Based on the confidence interval, decide if the null hypothesis should be rejected for a nondirectional test with α = .05.

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