In Exercise 12.75, you couldn't perform the chi-square independence test because the assumptions regarding expected frequencies were not met. As mentioned in the text, three approaches are available for remedying the situation: (1) combine rows or columns; (2) eliminate rows or columns; or (3) increase the sample size.
a. Combine the first two rows of the contingency table in Exercise 12.75 to form a new contingency table.
b. Use the table obtained in part (a) to perform the hypothesis test required in Exercise 12.75, if possible.
c. Eliminate the second row of the contingency table in Exercise 12.75 to form a new contingency table.
d. Use the table obtained in part (c) to perform the hypothesis test required in Exercise 12.75, if possible.