1.88 With respect to the four graphics in Section 1.1 on pages 1 and 2, complete the following:

a. What statistical population is of concern for all of these graphics?

b. Identify one specific graphic. What variables were used to collect the information needed to determine the statistics reported?

c. Name one statistic that is being reported in your graphic.

d. To obtain the data for your graphic, what methods do you think were used: convenience sample, volunteer sample, random sample, survey, observational study, experiment, or judgment sample?

e. Considering the method, how much faith do you have in the printed statistics? Describe possible biases.