Question

8. Calcium blockers are among several classes of medicines commonly prescribed to relieve high blood pressure. A study in Denmark has found that calcium blockers may also be effective in reducing the risk of heart attacks. A total of 897 randomly selected Danish patients, each recovering from a heart attack, were given a daily dose of the drug Verapamil, a calcium blocker. After eighteen months of follow-up, 146 of these patients had recurring heart attacks. In a control group of 878 randomly selected individuals, each of whom took placebos, 180 had a heart attack. At a 5% level of significance, do the data provide sufficient evidence to infer that calcium blockers are effective in reducing the risk of heart attacks? Assume that the samples are independent.

Answer 1