Suppose you want to test the effectiveness of a certain drug for treating a disease that is, you want to see if using the
drug is better the standard treatment. you select 150 patients to give the drug, and 150 patients to give the standard
treatment. name at least five factors you should control for in your samples to make the test more random

(co 3) the times that customers spend in a book store are normally distributed with a mean of 39.5 minutes and a standard deviation of 9.4 minutes. a random sample of 25 customers has a mean of 36.1 minutes or less. would this outcome be considered unusual, so that the store should reconsider its displays? no, the probability of this outcome at 0.035, would be considered usual, so there is no problem yes, the probability of this outcome at 0.035, would be considered unusual, so the display should be redone no the probability of this outcome at 0.359 would be considered usual, so there is no problem yes, the probability of this outcome at 0.965 would be considered unusual, so the display should be redone