The following display appeared in USA Today (June 29, 2009). It is meant to be a bar graph of responses to the ques-tion shown in the display.
a. Is response to the question a categorical or numerical variable?
b. Explain why a bar chart rather than a dotplot was used to display the response data.
c. There must have been an error made in constructing this display. How can you tell that it is not a correct represen-tation of the response data?