To see whether students who nish an exam rst get the same grades as those who nish later, a professor kept track of the order in which papers were handed in. Of the rst 25 papers, 10 received a "B" or better, compared with 8 of the last 24 papers handed in. Research ques- tion: At α = .10, is the grade independent of the order handed in? Since it is a 2 × 2 table, try also a two-tailed, two-sample z test for π1 = π2 (see Chapter 10) and verify that z2 is the same Grades as your chi-square statistic. Which test do you prefer? Why?
Answer to relevant QuestionsFrom 74 of its restaurants, Noodles & Company managers collected data on per-person sales and the percent of sales due to "potstickers" (a popular food item). Both numerical variables failed tests for normality, so they ...Forecasters' interest rate predictions over an eight-year period were studied to see whether the predictions corresponded to what actually happened. The 2 × 2 contingency table below shows the frequencies of actual and ...The actual distribution of car colors for 2006 model car buyers is shown below. Based on the sample of 200 car buyers for 2012 model vehicles, use the multinomial chi-square GOF test at α = .05 to test whether car buyers' ...Pick one Excel data set (A through F) and investigate whether the data could have come from a normal population using α = .01. Use any test you wish, including a histogram, or MegaStat's Descriptive Statistics > Normal ...Market research has shown that Americans will continue to eat out even in a depressed economy. A market analysis during the most recent recession showed the following distribution of visits to the various types of ...
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