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Which of these hypotheses is the most appropriate alternative hypothesis for this problem? (Q2) A: h = lB: H > LC: H = LD: H < LE: h < lF: h > l(Q3) Suppose that the population distributions of the number of emails sent in the byhigh-speed-connection customers and by low-speed-connection customers both arenearly normal. Which of the following have probability histograms that can beapproximated well by a normal curve, after transforming to standard units? (select allthat apply)
Suppose we construct a Z statistic by transforming H-L to standard units(approximately). Under the alternative hypothesis, the expected value of Z would be(Q4) A: NegativeB: zeroC: PositiveSo we should (Q5) A: consult a statisticianB: use a left-tail testC: use a right-tail testD: use a two-tail testTo test the null hypothesis at significance level 10%, we should reject the nullhypothesis if (Q6) A: the z-scoreB: the absolute value of the z-score(Q7) A: less thanB: greater than(Q8)(Q8)1.28(continues from q6 and q7)For high-speed-connection customers, the sample mean number of emails in themonth is 293, and the sample standard deviation of the number of emails in the monthis 117. For low-speed-connection customers, the sample mean number of emails inthe month is 274, and the sample standard deviation of the number of emails in themonth is 135.The estimated standard error of H - L is (Q9) 2211713591.19259.5495300400.The z-score is (Q10) 293274191.999.54959.5495HLHLzSE.