a. After collecting the average (mean) global temperatures for each of the most recent 100 years, we want to construct the graph that is most appropriate for these data. Which graph is best?

b. After collecting the average (mean) global temperature and the amount of carbon monoxide emissions for the most recent 100 years, we want to construct a graph to investigate the association between those two variables. Which graph is best?

c. An investigation of carbon monoxide sources includes motor vehicles, furnaces, fires, coalburning power plants, and tobacco smoke. If we want to construct a graph that illustrates the relative importance of these sources, which graph is best?