Question: What is the difference between two population means with unknown standard deviations and two populations means with known standard deviations? One uses the difference of

What is the difference between two population means with unknown standard deviations and two populations means with known standard deviations? One uses the difference of sampling means and the other uses the difference of the means. One uses the normal distribution and the other uses the normal distribution modified by the degrees of freedom. One uses the random variable and the other uses a non random variable. One uses dependent samples and the other uses independent samples

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