A fitness expert claims that 25% of adults do not know
how to swim. To test this claim, an SRS of 20 adults is
taken. Two of the adults do not know how to swim. A
simulation of 100 trials is conducted based on the
assumption that 25% is the true probability that an
adult does not know how to swim.
D. There is about a 12% chance of 2 or fewer nonswimmers in a group of 20. This is not unusual and is not convincing evidence that the true probability that an adult cannot swim is less than 25%.
