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QUESTION 19 In order to conduct a dierence-in-means test, as you did in question 6, you must meet a number of requirements or make several assumptions. One of these is that the \"sampling distribution is normal\" or "normally distributed.\" i. First, what is a \"sampling distribution\"? Key point: what it is it made up of\"? QUESTION 20 In order to conduct a difference-in-means test, as you did in the earlier hypothesis testing problem, you must meet a number of requirements or make several assumptions. One of these is that the \"sampling distribution is normal" or \"normally distributed.\" ii. How do we know that a sampling distribution is normal? What tells us that this is the case? Explain