Estimating a Difference Score Imagine that instead of estimating a single population mean μ, you wanted to estimate the difference between two population means μ 1 and μ 2 , such as the difference between the mean weights of two football teams. The statistic has a sampling distribution just as the individual means do, and the rules of statistical inference can be used to calculate either a point estimate or a confidence interval for the difference between the two population means. Suppose you wanted to know which was greater, the mean weight of Landers College's football team or the mean weight of Ingram College's team. You already have a point estimate of 198 pounds for Landers's team. Suppose that you draw a random sample of players from Ingram's team, and the
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