Refer to Exercise 13.27.

a. Convert the frequency responses to percentages by calculating the percentage of each column total falling in each row. Also, convert the row totals to percentages of the total number of responses. Display the percentages in a table.

b. Create a bar graph with row 1 percentage on the vertical axis and column number on the horizontal axis.

Show the row 1 total percentage as a horizontal line on the graph.

c. What pattern do you expect to see if the rows and columns are independent? Does the plot support the result of the test of independence in Exercise 13.27?