Concept explainers
a.
Test whether the data provide sufficient evidence to conclude that the rows and columns are dependent at
b.
Check whether the analysis change if the row totals were fixed before the data were collected.
c.
Explain whether the assumptions required for the analysis to be valid differ according to whether the row ( or column) totals are fixed.
d.
Convert the table entries to percentages, using each column total as a base and calculating each row response as a percentage of the corresponding column total.
Find the row totals and convert them to percentages of all 250 observations.
e.
Draw a bar graph with row 1 on the vertical axis and column number on the horizontal axis.
Draw the row 1 total percentage as a horizontal line on the graph.
Check whether the graph support the result of the test conducted in part a.
f.
Draw a bar graph with row 2 on the vertical axis and column number on the horizontal axis.
Draw the row 2 total percentage as a horizontal lie on the graph.
Check whether the graph support the result of the test conducted in part a.
g.
Draw a bar graph with row 3 on the vertical axis and column number on the horizontal axis.
Draw the row 3 total percentage as a horizontal lie on the graph.
Check whether the graph support the result of the test conducted in part a.
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