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Chapter 10: Q.25 (page 670)
AP3.25. Suppose the null and alternative hypotheses for a significance test are defined as Which of the following specific values for Ha will give the highest power?
(a)
(b)
(c)(d)
(e)would give the highest power.
Hence ,the correct option is (a)
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Coaching and SAT scores (10.1) What proportion of students who take the SAT twice are coached? To answer this question, Jannie decides to construct a confidence interval. Her work is shown below. Explain what’s wrong with Jannie’s method.
A CI for is
We are confident that the proportion of students taking the SAT twice who are coached is between and percentage points lower than students who aren’t coached.
Explain why the conditions for using two-sample z procedures to perform inference about are not met in the settings
Don’t drink the water! The movie A Civil Action (Touchstone Pictures ) tells the story of a major legal battle that took place in the small town of Woburn, Massachusetts. A town well that supplied water to eastern Woburn residents was contaminated by industrial chemicals. During the period that residents drank water from this well, of the babies born had birth defects. On the west side of Woburn, of the babies born during the same time period had birth defects.
Credit cards and incentives A bank wants to know which of two incentive plans will most increase the use of its credit cards. It offers each incentive to a group of current credit card customers, determined at random, and compares the amount charged during the following six months.
(a) Is this a problem with comparing means or comparing proportions? Explain.
(b) What type of study design is being used to produce data?
Men versus women The National Assessment of Educational Progress (NAEP) Young Adult Literacy Assessment Survey interviewed a random sample of people to years old. The sample contained men and women. The mean and standard deviation of scores on the NAEP's test of quantitative skills were and for the men in the sample. For the women, the results were and . Is the difference between the mean scores for men and women significant at the level? Give appropriate statistical evidence to justify your answer.
School has students and School has students. A local newspaper wants to compare the distributions of SAT scores for the two schools. Which of he following would be the most useful for making this comparison?
(a) Back-to-back stemplots for A and B
(b) A scatterplot of A versus B
(c) Dotplots for A and B drawn on the same scale
(d) Two relative frequency histograms of A and B drawn on the same scale
(e) Two frequency histograms for A and B drawn on the same scale
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