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risk that different from the placebo group's? Explain. About 328 million (328,000,000) people live in the United States. Assume all of these people had the same infection risk as those in the placebo group during the months of this study. How many people in the country would you expect to contract the coronavirus? . Assume the U.S. population had the same infection risk as the vaccine group. How many people would you expect to become infected? . Put these numbers in the appropriate places of the table's final column. FIND THE Efficacy: Now that we've analyzed infection risks, let's calculate the efficacy. First, find the difference between the risks in both groups. Then scale the percentage point difference in risks by the original infection risk