Q6 A random sample of 1000 motor-vehicle accident records involving vintage cars was examined. For each accident, the type of safety restraint and whether or not any of the car occupant(s) were hospitalized were recorded: Seat Belt Worn? Yes No Hospitalized? No 25 25 Yes 575 375 Based on the statistical tables in the Weiss text, the p-value for the most appropriate test for these data would most accurately be described as A. > 0.01 B. > 0.10 C. > 0.20 D. None of the above, as the conditions for the relevant hypothesis test are not met Q. 7-9: Read the information below and then select the most appropriate option for each question. Researchers have developed computer simulations of smallpox epidemics in small communities. The graphs below, of numbers of smallpox cases per day in a representative simulation, illustrate the epidemics that might result under two possible containment strategies, A and B (described below). In each case, the epidemic is considered to have been started by deliberate initial infection of 500 people, simulating a possible bioterrorist attack. 1207 500 Initial infectives Strategy A: 'Surveillance and Containment Only' (i.e. isolation of known cases and vaccination of their close contacts) 500 Initial nfectives Strategy B: "Mass Vaccination + Surveillance and Containment' (i.e. mass vaccination of 80% of the population is implemented in addition to surveillance and containment) Day The heavily-edited SAS output below shows sample statistics for the numbers of smallpox cases (variable 'Cases') occurring between days 20 and 35 (16 days) of the epidemics shown in the graphs above. Note: the number of cases occurring between these days is normally distributed for both strategies; and the population variances of the numbers of cases are assumed to be different for the strategies. Strategy A ---- The UNIVARIATE Procedure : Cases Sum Weights Mean Sum Observations 404 Std Deviation Variance Corrected SS 1833 ------- Strategy=B ------- The UNIVARIATE Procedure Variable: Cases 16 Sum Weights Mean 9. 1875 Sum Observations 147 Std Deviation 7. 03532752 7. What is the test statistic value (accurate to two decimal places) for the most appropriate test of whether there is any difference (strategy A minus strategy B) in the true average numbers of cases occurring between days 20 and 35 of the two strategies? A. 16.06 B. 3.33 C. 5.63 D. 3.58 8. Based on the statistical tables in Weiss, the p-value for the most appropriate test of whether there is any difference in the true average numbers of cases occurring between days 20 and 35 of the two strategies is: (select the most precise answer) A. 0.9950 D. > 0.9750