An educator wants to determine whether a new curriculum signiﬁcantly improves standardized test scores for third grade students. She randomly divides 80 third-graders into two groups. Group 1 is taught using the new curriculum, while group 2 is taught using the traditional curriculum. At the end of the school year, both groups are given the standardized test and the mean scores are compared.
Answer to relevant QuestionsConduct each test at the α = 0.05 level of signiﬁcance by determining (a) The null and alternative hypotheses, (b) The test statistic, (c) The critical value, and (d) The P-value. Assume that the samples were obtained ...Construct a conﬁdence interval for p1 - p2 at the given level of conﬁdence. x1 = 109, n1 = 475, x2 = 78, n2 = 325, 99% conﬁdence In October 1947, the Gallup organization surveyed 1100 adult Americans and asked, “Are you a total abstainer from, or do you on occasion consume, alcoholic beverages?” Of the 1100 adults surveyed, 407 indicated that they ...In the Sullivan Statistics Survey, respondents were asked, “Would you be willing to pay higher taxes if the tax revenue went directly toward deﬁcit reduction?” Treat the respondents as a simple random sample of adult ...Accupril, a medication supplied by Pﬁzer Pharmaceuticals, is meant to control hypertension. In clinical trials of Accupril, 2142 subjects were divided into two groups. The 1563 subjects in group 1 (the experimental group) ...
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