In October 2018, a random sample of 2,000 Americans found th…

In October 2018, a random sample of 2,000 Americans found that 26% of them knew how many amendments to the U.S. Constitution comprised the Bill of Rights. Calculate a 95% confidence interval for the proportion of Americans that know how many amendments there are in the Bill of Rights.

Boston Children’s Hospital estimates that 80% of Americans h…

Boston Children’s Hospital estimates that 80% of Americans have had chickenpox by the time they reach adulthood. Calculate the probability that at most 74 out of 100 randomly sampled American adults had chickenpox during childhood. Use normal approximation if needed.