Can people really identify their favorite brand of cola? Volunteers tasted Coke, Pepsi, Diet Coke, and Diet Pepsi, with the results shown below. Research question: At α = .05, is the correctness of the prediction different for regular cola and diet cola drinkers? Since it is a 2 × 2 table, try also a two-tailed, two-sample z test for π1 = π2 and verify that z2 is the same as your chi-square statistic.
Answer to relevant QuestionsA survey of randomly chosen new students at a certain university revealed the data below concerning the main reason for choosing this university instead of another. Research question: At α = .01, is the main reason for ...In a four-digit lottery, each of the four digits is supposed to have the same probability of occurrence. The table shows the frequency of occurrence of each digit for 89 consecutive daily four-digit drawings. Research ...Refer to the previous problem. In the 2002 World Series, a total of 85 runs were scored. (a) Before doing any calculations, based on your understanding of baseball, why might runs per inning not be uniform? (b) Complete ...Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group. (a) Make a bar chart and describe it. (b) Calculate expected frequencies for each ...A basketball player took 35 free throws during the season. Her sequence of hits (H) and misses (M) is shown. Research question: At α = .01, is her hit/miss sequence random? HMMHHMHMMHHHHHMMHHMMHMHHHMHHHHMMMHH
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