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Simple random sample data, based on two independent samples of with sample size 36 for each, give us xbar1 = 505, xbar2 = 520, 51

Simple random sample data, based on two independent samples of with sample size 36 for each, give us xbar1 = 505, xbar2 = 520, 51 = 20, and s2 = 25. What is a 95% confidence interval for mu2 mu1, assuming the two population variances are equal

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