(a) A sample of households in a community isselected at random from the telephone directory. In thiscommunity, 3% of households have no telephone, 18%have only cell phones, and another 25% have unlistedtelephone numbers. The sample will certainly suffer fromA. undercoverage.B. false responses.C. nonresponse.D. None of the above.(b) An opinion poll contacts 1917 adults and asks them,"Which political party do you think has better ideas forleading the country in the 21st century?" In all, 533 ofthe 1917 say, " The Democrats." The sample in thissetting isA. all 235 million adults in the United States.B. the 1917 people interviewed.C. the 533 people who chose the Democrats.D. None of the above.(c) A committee on community relations in a collegetown plans to survey local businesses about theimportance of students as customers. From telephonebook listings, the committee chooses 240 businesses atrandom. Of these, 72 return the questionnaire mailed bythe committee. The population for this study isA. the 72 businesses that returned the questionnaire.B. all businesses in the college town.C. the 240 businesses chosen.D. None of the above.

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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To compare two elementary schools regarding teaching of reading skills, 12 sets of identical twins were used. In each case, one child was selected at random and sent to school A, and his or her twin was sent to school B. Near the end of fifth grade, an achievement test was given to each child. The results follow: Twin Pair 1 2 3 4 5 6 School A 168 157 115 99 119 132 School B 123 142 110 110 120 122 Twin Pair 7 8 9 10 11 12 School A 120 121 132 145 138 88 School B 105 90 124 142 148 104 Suppose a sign test for matched pairs with a 8% level of significance is used to test the hypothesis that the schools have the same effectiveness in teaching reading skills against the alternate hypothesis that the schools have different levels of effectiveness in teaching reading skills. Let p denote portion of positive signs when the scores of school B are subtracted from the corresponding scores of school…
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