In a study of the link between high blood pressure and cardiovascular disease, a group of white males aged 35 to 64 was followed for five years. At the beginning of the study, each man had his blood pressure measured and it was classified as either “low” systolic blood pressure (less than 140 mm Hg) or “high” systolic blood pressure (140 mm Hg or higher). The following table gives the number of men in each blood pressure category and the number of deaths from cardiovascular disease during the five-year period.Blood pressureDeathsTotalLow102000High503500Based on these data, which of the following statements is correct?A.These data are consistent with the idea that there is a link between high systolic blood pressure and death from cardiovascular disease.B.The mortality rate (proportion of deaths) for men with high systolic blood pressure is five times that of men with low systolic blood pressure.C.These data probably understate the link between high blood pressure and death from cardiovascular disease since men will tend to understate their true blood pressure.D.All of the above2.It is a fact that since the 1960s, atmospheric CO2 levels have increased steadily, as have obesity rates. We can conclude thatA.higher CO2 levels lead to greater obesity rates.B.there may be a lurking variable (such as greater car ownership and increased reliance on car use) that simultaneously impacts both variables in this study. Correlation doesn’t imply causation.C.the correlation between “CO2 level” and “obesity rate” is negative.D.both B and C are true, whereas A is false.3.