More than 10% of people carry the parasite Toxoplasma gondii. The following table gives data from Prague on 15- to 29-year-old drivers who had been involved in accidents. The table gives the number of drivers who were infected with Toxoplasma gondii and who were uninfected. These numbers are compared with a control sample of 249 drivers of the same age living in the same area who had not been in an accident.

a. What type of table is this?

b. What are the two variables being compared? Which is the explanatory variable and which is the response?

c. Depict the data in a graph. Use the results to answer the question: are the two variables associated in this data set?

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Drivers with accidents Drivers with accidents Controls Controls Infected 2121 3838 Uninfected 3838 211211