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Mathematics, 12.08.2020 07:01 sswd
Two independent samples of sizes 20 and 30 are randomly selected from two normally distributed populations. Assume that the population variances are unknown but equal. In order to test the difference between the population means, mu subscript 1 minus mu subscript 2 , the sampling distribution of the sample mean difference, X with bar on top subscript 1 minus X with bar on top subscript 2 , is
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