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Section Exercise 15-8 Advertisers need to know which age groups are likely to see their ads. Purchasers of120 copies of Cosmopolitan are shown by age group. Purchaser Age 1324 2534 3544 45 54 5564 65+ Total Click here for the Excel Data File (a) Calculate the chisquare test sta Units Sold 38 28 19 16 10 istic, degrees of freedom, and the p-value. Assume the expected frequencies are equal. {Perform a uniform goodness-of-fit test. Round your test statistic value to 2 decimal places and the pvalue to 4 decimal places.) Test statistic d.f. pvalue {b} Choose the correct answer. {You may select more than one answer. Click the box with a check mark for the correct answer and double click to ernptrrr the box for the wrong answer.) D The least purchases are by the 3344 age group. Most purchases are byrhe18-24 age group. The least purchases are by the 65+ age group. Most purchases are by'rhe 45-54 age group. Section Exercise 15-6 J.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 with screens between 3.5 and 3.9 inches as stayed fairly steady at 40 percent, while that for smartphones with screens less than 3.5 inches has declined to 36 percent. Does smartphone ownership by college students follow this national pattern? A sample of 148 student smartphone users showed that 30 owned a smartphone with a large screen (4 inches or greater), 75 owned a smartphone with a mediumsized screen (between 3.5 and 8.9 inches), and 43 owned a smartphone with a small screen (less than 3.5 inches). Conduct a chi-square GOF test to answer this esearch question. (Round your answers to 4 decimal places.) Choose a = .05. a) Choose the correct hypotheses. Option 1 Ho: College students' ownership of smartphones steadily stayed at 40 percent. H1: College students' ownership of smartphones does not stay at 40 percent. Option 2 He: College students' ownership of smartphones follows the national trend. Hy: College students' ownership of smartphones does not follow the national trend. O Option 1 O Option 2 b) X calc p-value ) Since (Click to select) |.05, we (Click to select) | H, and conclude that college students' ownership of smartphones Click to select) |follow the national trend.Section Exercise 15-35 Oxnard Kortholt, Lid., employs 50 workers. Research question: At a = .05, do Oxnard employees differ significantly from the national percent distribution? Oxnard Employees Health Care Visits National Percentage Frequency No visits 16.5 4 1-3 visits 45 .8 20 4-9 visits 24.4 15 10 or more visits 13.3 11 Total 100.0 50 Expicture Click here for the Excel Data File (a) The hypothesis for the given issue is He: Oxnard employees do not differ significantly from the national percent distribution. O Yes O No (b) Calculate the chi-square test statistic, degrees of freedom and the p-value. (Round your test statistic value to 3 decimal places and the p-value to 4 decimal places.) Test statistic d.f. p-value (c) We fail to reject the null hypothesis. O Yes O NoSection Exercise 15-2 Teenagers make up a large percentage ofthe market for clothing. Below are data on running shoe ownership in four world regions [excluding China). At (1:01, does this sample show that running shoe ownership depends on world region? Running Shoe Ownership in Horld Regions Owned By U.S. Europe Asia Lat in America Row Total Teens 86 EB 59 65 303 Adults 26 11 31 35 9? Col Total 199 108 168 100 400 3 Click here forthe Excel Data File ta] The hypothesis for the given issue is He: Age Group and World Region are independent. Yes O No {b} Calculate the chisquare test statistic, degrees of freedom, and the pVEIUE'. (Round your test statistic value to 2 decimal places and the pvalue 104 decimal places.) Test statistic d.f. pualue (c) Find the critical value for chiSquare. Refer to the chisquare appendix E table. [Round your answer to 2 decimal places} Critical value Id} We reject the null hypothesis. O No Q) Yes ls HDTV ownership related to quantity of purchases of other electronics? A Best Buy retail outlet collected the tollowing data for a random sample of its recent customers. At {1:10, is the frequency of inistore purchases independent ofthe number of largeiscreen HDTVs owned (defined as 50 inches or more)? In75tor'e Purchases Last Ponth HDTV: Owned None One Fore Than One Rm Total None 13 14 13 40 One 18 31 31 80 Two or' More E E E 2 Col Total 59 90 110 250 Click here for the Excel Data File (a) The hypothesis for the given issue is He: HDTVS Owned and In Store Purchases are independent. O No Q Yes (b) Calculate the chi-square test statistic, degrees of freedom, and the p-value. (Round your test statistic value to 2 decimal places and the pvalue 1o 4 decimal places.) Test statistic d.f. psvalue (c) Find the critical value for chi-Square. Refer to the chisquare pendix E table. [Round your answer to 2 decimal places.) Critical value (d) We reject the null hypothesis. 0 Yes O No