Ebook Statistics for business and economics (9th edition): Part 2
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Ebook Statistics for business and economics (9th edition): Part 2
www.downloadslide.comCHAPTER10Two Population Hypothesis Tests10.1Tests of the Difference Between Two Normal Population Means: Dependent SamplesTwo Mea Ebook Statistics for business and economics (9th edition): Part 2ans, Matched Pairs10.2Tests of the Difference Between Two Normal Population Means: Independent SamplesTwo Means, Independent Samples, Known Population Variances Two Means, Independent Samples, Unknown PopulationVariances Assumed to Be EqualTwo Means, Independent Samples, Unknown Population Variances Ebook Statistics for business and economics (9th edition): Part 2 Not Assumed to Be Equal10.3Tests of the Difference Between Two Population Proportions (Large Samples)10.4Tests of the Equality of the Variances BetweEbook Statistics for business and economics (9th edition): Part 2
en Two Normally Distributed Populations10.5Some Comments on Hypothesis TestingIntroductionIn this chapter we develop procedures for testing the differwww.downloadslide.comCHAPTER10Two Population Hypothesis Tests10.1Tests of the Difference Between Two Normal Population Means: Dependent SamplesTwo Mea Ebook Statistics for business and economics (9th edition): Part 2 Chapter 8. Our discussion in this chapter follows the development in Chapter 9, and we assume that the reader is familiar with the hypothesis-testing procedure developed in Section 9.1. The process for comparing two populations begins with an investigator forming a hypothesis about the nature of th Ebook Statistics for business and economics (9th edition): Part 2e two populations and the difference between their means or proportions. The hypothesis is stated clearly as involving two options concerning the diffEbook Statistics for business and economics (9th edition): Part 2
erence. These two options are the only possible outcomes. Then a decision is made based on the results of a statistic computed from random samples of www.downloadslide.comCHAPTER10Two Population Hypothesis Tests10.1Tests of the Difference Between Two Normal Population Means: Dependent SamplesTwo Mea Ebook Statistics for business and economics (9th edition): Part 2ity in order to ensure high quality for every unit produced. Consider the following two examples as typical problems:1 An instructor is interested in knowing if assigning case studies increases students' test scores in her course. To answer her question, she could first assign cases in one section a Ebook Statistics for business and economics (9th edition): Part 2nd not in the other. Then, by collecting data385www.downloadslide.comhttps://khothuvien.cori!from each class, she could determine if there is strong eEbook Statistics for business and economics (9th edition): Part 2
vidence that the use of case studies increases exam scores.To provide strong evidence that the use of cases increases learning, she would begin by asswww.downloadslide.comCHAPTER10Two Population Hypothesis Tests10.1Tests of the Difference Between Two Normal Population Means: Dependent SamplesTwo Mea Ebook Statistics for business and economics (9th edition): Part 2ed case studies, and let M2 denote the mean final examination score in the class that did not use case studies. For this study the null hypothesis IS the composite hypothesisHo: Ml - M2 - 0which states that the use of cases does not increase the average examination score. The alternative topic of in Ebook Statistics for business and economics (9th edition): Part 2terest is that the use of cases actually increases the average examination score, and. thus, the alternative hypothesis is as follows:HrMi - M2 > 0InEbook Statistics for business and economics (9th edition): Part 2
this problem the instructor would decide to assign cases only if there is strong evidence that using cases increases the mean examination score. Stronwww.downloadslide.comCHAPTER10Two Population Hypothesis Tests10.1Tests of the Difference Between Two Normal Population Means: Dependent SamplesTwo Mea Ebook Statistics for business and economics (9th edition): Part 2tain the same decision process.2 A news reporter wants to know if a tax reform appeals equally to men and women. To test this, he obtains the opinions of randomly selected men and women. These data are used to provide an answer. The reporter might hold, as a working null hypothesis, that a new tax p Ebook Statistics for business and economics (9th edition): Part 2roposal is equally appealing to men and women. Using P|, the proportion of men favoring the proposal, minus P2, the proportion of women favoring the pEbook Statistics for business and economics (9th edition): Part 2
roposal, the null hypothesis is as follows:«0*1 = p2orHO:P1 - p2 = 0If the reporter has no good reason to suspect that the bulk of support comes from www.downloadslide.comCHAPTER10Two Population Hypothesis Tests10.1Tests of the Difference Between Two Normal Population Means: Dependent SamplesTwo Mea Ebook Statistics for business and economics (9th edition): Part 2 example, rejection of H,. would provide strong evidence that there is a difference between men and women in their response to the tax proposal.www.downloadslide.comCHAPTER10Two Population Hypothesis Tests10.1Tests of the Difference Between Two Normal Population Means: Dependent SamplesTwo MeaGọi ngay
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