It can be hard to see a vaccine’s impact in terms of percentages. Let’s answer the same questions as in Question 1 after calculating what the infection risks indicated by Pfizer’s study would look like if applied to the entire population of the United States.
Answer the following questions using your answers from Question 1:
1. 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? Hint: Multiply the U.S. population by the infection risk (before multiplying, write the infection risk as a decimal: 0.74% = 0.0074). The answer is . Your answer should be a whole number.
2. Assume the U.S. population had the same infection risk as the vaccine group. How many people would you expect to become infected? The answer is . Your answer should be a whole number.
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