A team of marketing research students was asked to determine the pizza best liked by students enrolled in the team's college. Two years ago a similar study was conducted, and it was found that 40% of all students at this college preferred Bellini's pizza, 25% chose Anthony's pizza as the best, 20% selected Ferrara's pizza, and the rest selected Marie's pizza. To see if preferences have changed, 180 students were randomly selected and asked to indicate their pizza preferences. The results were as follows: 40 selected Ferrara's as their favorite, 32 students chose Marie's, 80 students preferred Bellini's, and the remainder selected Anthony's. Do the data indicate that the preferences today differ from those from the last study?
Answer to relevant QuestionsGiven the following analysis of variance table, compute mean squares for between groups and within groups. Compute the F ratio and test the hypothesis that the group means are equal. Use the model for the one-way analysis of variance for the data of Exercise 15.12. a. Estimate µ b. Estimate Gi for each of the three magazines. c. Estimate e13, the error term corresponding to the third observation (11.15) ...Using the data of Exercise 15.6, carry out a test of the null hypothesis of equality of the three population mean numbers of parts per shipment not conforming to standards without assuming normality of population ...Consider a two-way analysis of variance with one observation per cell and randomized blocks with the following results: Compute the mean squares and test the hypotheses that between-group means are equal and betweenblock ...Four brands of fertilizer were evaluated. Each brand was applied to each six plots of land containing soils of different types. Percentage increases in corn yields were then measured for the 24 brand-soil-type ...
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