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Under what conditions should you use the chi-square test to determine whether there is a difference between the proportions of more than two independentpopulations? Answer in two paragraphs.
Under what conditions should you use the chi-square test of independence?
1. Under what conditions should you use the chi -squaretest to determine whether there is a difference between proportionsof two independent populations?Answer in two paragraphs.
study published in the American Journal of Public Health was conducted to determine whether the use of seat belts in motor vehicles depends on ethnic status in SanDiego County. A sample of 792 children treated for injuries sustained from motor vehicle accidents was obtained, and each child was classified according to (1) ethnicstatus (Hispanic or non-Hispanic) and (2) seat belt usage (worn or not worn) during the accident.Referring to Table, which test would be used to properly analyze the data...
The purpose of this activity is to gain experience conducting a chi-square test of independence using technology. Recall the report On the Front Line: The Work of First Responders in a Post-9/11 World. We will use data from this report to investigate the question: Are alcohol-related problems among New York firefighters associated with participation in the 9/11 rescue? Here again are our observed data: No Risk for Alcohol Problems Moderate to Severe Risk for alcohol problems Participated in 911 rescue...
In order to apply the chi-square test of independence, we prefer to haveAnswer and Explainnot more than 5 observations in each cell.at least 5 observations in each cell.at least 5 expected observations in each cell.at least 5 percent of the observations in each cell.
* (½ point) The Pearson Chi-square test is used to test hypotheses about what? Differences in proportions between two groups Differences in proportions between more than two groups Association between two categorical variables All of the above * (½ point) The paired t test is used to test hypotheses about what? Differences in proportions between two groups Differences in means between individuals Means of differences within individuals All of the above * (½ point) If one performs four hypothesis tests...
A large negative chi-square test statistic would indicate that the null hypothesis should be rejected.Answer True or false
A large negative chi-square test statistic would indicate that the null hypothesis should be rejected.AnswerTrueFalse
A wholesaler has recently developed a computerized sales invoicing system. Prior to implementing this system, a manual system was used. The distribution of thenumber oferrors per invoice for the manual system is as follows:Errors per Invoice0123More Than 3Percentage of Invoices87%8%3%1%1%Errors per Invoice0123More Than 3Number of Invoices47910821a- Show that it is appropriate to carry out a chi-square test using these data.b -Use the following Excel output to determine whether the error percentages for thecomputerized system differ from those for the manual...