# Question

Two tutoring services offer crash courses in preparation for the CPA exam. To check on the effectiveness of these services, 15 students were chosen. Five students were randomly assigned to service A, 5 were assigned to service B, and the remaining 5 did not take a crash course. Their scores on the examination, expressed as percentages, are given in the table.

a. Prepare the analysis of variance table.

b. Test the null hypothesis that the three population mean scores are the same.

c. Compute the minimum significant difference and indicate which subgroups have different means.

a. Prepare the analysis of variance table.

b. Test the null hypothesis that the three population mean scores are the same.

c. Compute the minimum significant difference and indicate which subgroups have different means.

## Answer to relevant Questions

In the study of Example 15.1, independent random samples of six advertisements from True Confessions, People Weekly, and Newsweek were taken. The fog indices for these advertisements are given in the accompanying table. Test ...Consider a problem with four subgroups with the sum of ranks in each of the subgroups equal to 71, 88, 82, and 79 and with subgroup sizes equal to 5, 6, 6, and 7. Complete the Kruskal-Wallis test and test the null hypothesis ...Based on the data of Exercise 15.9, use the Kruskal Wallis method to test the null hypothesis of equality of growth predictions for population mean sales for the four regions. In exercise Four financial analysts were asked to predict earnings growth over the coming year for five oil companies. Their forecasts, as projected percentage increases in earnings, are given in the accompanying table. a. Prepare the ...Suppose that, in the two-way analysis of variance setup with one observation per cell, there are just two groups. Show in this case that the F ratio for testing the equality of the group population means is precisely the ...Post your question

0