For each of the following studies, identify the type of graph (histogram, time series graph, or scatter diagram) that would be the most appropriate. (You can use more than one graph of each type, for example, two histograms.)

a. Do countries with lots of smokers have lots of lung-cancer deaths?

b. Does the time between eruptions of the Old Faithful geyser depend on the duration of the preceding eruption?

c. Is there more variation in annual rainfall in Los Angeles or in New York?

d. Have temperatures in Los Angeles gone up or down over the past 100 years?

e. Could the states that John McCain won and lost in 2008 have been predicted from how well George W. Bush did in each state in 2004?