12-1 One-Way ANOVA 625 10. Clancy, Rowling, and Tolstoy Characters per Word Numbers of characters per word were found from the same three books used in the preceding exercise. Use a 0.05 significance level to test the claim that the three books have the same mean number of characters per word. Does it appear that any of the authors use words with more characters? Clancy 4.8 4.5 4.6 4.5 4.0 4.0 4.6 4.5 4.4 4.4 4.3 4.3 Rowling 4.1 4.2 4.2 4.4 4.3 4.2 4.5 4.5 4.3 4.0 4.4 4.3 Tolstoy 4.3 4.5 4.5 4.5 4.5 4.8 4.3 4.2 4.7 4.3 4.4 4.5 11.Triathlon Times Jeff Parent is a statistics instructor who participates in triathlons. Listed below are times (in minutes and seconds) he recorded while riding a bicycle for five stages through each mile of a 3-mile loop. Use a 0.05 significance level to test the claim that it takes the same time to ride each of the miles. Does one of the miles appear to have a hill? Mile 1 3:15 3:24 3:23 3:22 3:21 Mile 2 3:19 3:22 3:21 3:17 3:19 Mile 3 3:34 3:31 3:29 3:31 3:29 12.Arsenic in Rice Listed below are amounts of arsenic in samples of brown rice from three different states. The amounts are in micrograms of arsenic and all samples have the same serving size. The data are from the Food and Drug Administration. Use a 0.05 significance level to test the claim that the three samples are from populations with the same mean. Do the amounts of arsenic appear to be different in the different states? Given that the amounts of arsenic in the samples from Texas have the highest mean, can we conclude that brown rice from Texas poses the greatest health problem? Arkansas 4.8 4.9 5.0 5.4 5.4 5.4 5.6 5.6 5.6 5.9 6.0 6.1 California 1.5 3.7 4.0 4.5 4.9 5.1 5.3 5.4 5.4 5.5 5.6 5.6 Texas 5.6 5.8 6.6 6.9 6.9 6.9 7.1 7.3 7.5 7.6 7.7 7.7 In Exercises 13–16, use the data set in Appendix B. 13. Size of Vehicle and Head Injury Measurements Repeat Example 1 in this section after excluding the HIC measurements from small cars. The data are listed in Table 12-1 and Data Set 35 “Car Data.” 14.M&M Candies Refer to Data Set 38 “Candies” in Appendix B and use the weights of the M&M candies for each of the six colors. Use a 0.05 significance level to test the claim that the six different colors of M&M candies have the same mean weight. Is the result as expected? 15. Disney World Wait Times Refer to Data Set 33 “Disney World Wait Times” in Appendix B and use the 10 AM wait times for Space Mountain, Rock ‘n’ Roller Coaster, Tower of Terror, and Flight of Passage. Use a 0.05 significance level to test the claim that the four rides have the same mean wait time at 10 AM. 16.Disney World Wait Times Repeat the preceding exercise using the wait times at 5 PM instead of at 10 AM. 17.Tukey Test A display of the Bonferroni test results from Table 12-1 (which is part of the Chapter Problem) is provided on page 621. Shown on the top of the next page is the SPSS-generated display of results from the Tukey test using the same data. Compare the Tukey test results to those from the Bonferroni test. 12-1 Beyond the Basics continued
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