Two contingency tables below show return on investment (ROI) and percent of sales growth over the previous 5 years for 85 U.S. rms. ROI is defined as percentage of return on a combination of stockholders' equity (both common and preferred) plus capital from long-term debt including current maturities, minority stockholders' equity in consolidated subsidiaries, and accumulated deferred taxes and investment tax credits. Research question: At α = .05, is ROI independent of sales growth? Would you expect it to be? Do the two tables (2 × 2 and 3 × 3) agree? Are small expected frequencies a problem?
Answer to relevant QuestionsStudents applying for admission to an MBA program must submit scores from the GMAT test, which includes a verbal and a quantitative component. Shown here are raw scores for 100 randomly chosen MBA applicants at a Midwestern, ...Prof. Green's multiple-choice exam had 50 questions with the distribution of correct answers shown below. Research question: At α = .05, can you reject the hypothesis that Green's exam answers came from a uniform ...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 ...U.S. market share for smartphones with larger screens is increasing. As of the first quarter of 2011, smartphones with screens 4 inches or larger had captured 24 percent of the smartphone market. The market for smartphones ...Rates of return on 24 mutual funds are shown. (a) Convert the data to ranks. Check the column sums. (b) Calculate Spearman's rank correlation coefficient. Show your calculations. (c) At α = .01 can you reject the ...
Post your question