Answer Happy

Beer and Diapers: There is a popular story (among data miners) that there is a correlation between men buying diapers and buying beer while shopping. A student tests this theory by surveying 140 male shoppers as they left a grocery store. The results are summarized in the contingency table below. Observed Frequencies: Oi's Bought Did Not Diapers Buy Diapers Beer 7 25 No Beer 8 100 Totals 15 125 Totals 32 108 140 The Test: Test for a dependent relationship between buying beer and buying diapers. Conduct this test at the 0.05 significance level. (a) What is the test statistic? Round your answer to 3 decimal places. x2 = (b) What is the conclusion regarding the null hypothesis? O reject Ho O fail to reject Ho (c) Choose the appropriate concluding statement. The evidence suggests that all men who buy diapers also buy beer. The evidence suggests that the probability of a man buying beer is dependent upon whether or not he buys diapers. There is not enough evidence to conclude that the probability of a man buying beer is dependent upon whether or not he buys diapers. We have proven that buying beer and buying diapers are independent variables.