To test a drug intended to increase memory, 80 subjects were randomly given a pill that either contained the drug or was a placebo. After ten minutes, the subjects were asked to look at a poster with pictures of 20 common objects for five minutes. After waiting ten minutes, the subjects were asked to list as many of the objects as they could recall. For the subjects that took the drug, 75% were able to list at least half of the objects. For the subjects that took the placebo, 70% were able to list at least half of the objects. Check that the conditions are met for a hypothesis test to compare the population proportion of subjects that took the drug that could list at least half of the objects to the proportion that took the placebo that could. Select the correct answer below:. All of the conditions are met.
The samples are not random samples of the populations.
The samples are not independent.
Not all the values nip, miq, np, and nq are at least 5.