Find the value of the test statistic z using The claim is that the proportion of

Question

Find the value of the test statistic z using The claim is that the proportion of drawing deaths of children attributable to beaches is more than 0.25, and the sample statistics include n = 696 drowning deaths of children with 30% of them attributable to beaches. A) 3.05 B) -3.05 C) -2.88 D) 2.88 The principal of a middle school claims that the proportion of failing test scores of the seventh-graders at his school are less than the proportion of failing test scores of the seventh-graders at a neighboring school, which have a proportion of failing p = 14.7%. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is to reject the null hypothesis, state the conclusion in nontechnical terms. E) There is sufficient evidence to support the claim that the proportion is less than 14.7%. F) H) There is not sufficient evidence to support the claim that the proportion is less than 14.7%. G) There is not sufficient evidence to support the claim that the proportion is greater than 14.7%. H) There is not sufficient evidence to support the claim that the proportion is less than 14.7%. A manufacturer uses a new production method to produce steel rods. A random sample of 17 steel rods resulted in a proportion of defective rods = 4.7%. At the 0.10 significance level, test the claim that the new production method produces a proportion of defective rods different from 3.5%, which was the proportion for the old method. A) H_o: p = .035, H_1 = p .035, Fail to reject H_0 C) H_o: p = .035, H_1: p notequalto .035, Reject H_o D) H_o: p = .035, Fail to reject H_o

Explanation / Answer

17) option A is correct, 3.05

18) option F is correct

19) option D is correct, Fail to reject H0

20) option A is correct, since Z statistic = 0.63 - 0.5 / sqrt(0.5*0.5/100) = 2.6 > 1.96

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