A random sample of 250 observations was classified according to the row and column categories shown in the table below. Column 1 2 3 1 20 20 10 Row 2 10 20 70 3 20 50 30

a. Do the data provide sufficient evidence to conclude that the rows and columns are dependent? Test using a = .05.

b. Would the analysis change if the row totals were fixed before the data were collected?

c. Do the assumptions required for the analysis to be valid differ according to whether the row (or column) totals are fixed? Explain.

d. Convert the table entries to percentages by using each column total as a base and calculating each row response as a percentage of the corresponding column total. In addition, calculate the row totals and convert them to percentages of all 250 observations.

e. Create a bar graph with row 1 percentage on the vertical axis against the column number on the horizontal axis. Draw horizontal lines corresponding to the row 1 percentages. Does the graph support the result of the test conducted in part a?