You randomly divide 100 patients with arthritis into two groups, one of which receives a placebo and the other of which receives a new drug. At the end of two months, you count the number of patients...

You randomly divide 100 patients with arthritis into two groups, one of which receives a placebo and the other of which receives a new drug. At the end of two months, you count the number of patients who developed heart arrhythmias. In the 50 patients receiving a placebo, there was only 1. In the 50 patients receiving the drug, there were 7. Do patients on the drug have a significantly higher probability of developing an arrhythmia? (You will need statistical software to carry out the appropriate test.)