Given M 1 = 31, M 2 = 24, s M1M2 = 2.88, and t cv =
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Given M1 = 31, M2 = 24, sM1−M2 = 2.88, and tcv = 2.045,
(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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