For each situation, describe the type of statistical graph that could be made to answer the statistical question posted:

a. We have the systolic blood pressures by gender of a large number of elderly people. Our statistical question is, “Do these elderly men tend to have higher systolic blood pressure than these elderly women?”

b. We have demographic data on everyone who bought their ticket to a local football game online. Our statistical question is, “Which zip code bought the greatest number of tickets?”