Later in the paper, we find out that 619 out of 7,329 men who got Vitamin C had a "major cardiovascular event" compared to 626 out of 7,312 men who got the placebo. We also read that the p-value for a difference in incidence rates is 0.91. Find the incidence rates, state the null and alternative hypotheses for a test of the effectiveness of Vitamin C, and draw inferences about the effectiveness of Vitamin C in preventing major cardiovascular events in this sample.