Author Question: According to the Federal Communications Commission, 70 of all U.S. households have vcrs. In a random ... (Read 55 times)

cnetterville · **on:** Jul 24, 2018

According to the Federal Communications Commission, 70 of all U.S. households have vcrs. In a random sample of 15 households, what is the probability that at least 13 have vcrs?

A) 0.1268 B) 0.7 C) 0.8732 D) 0.5

Question 2

A medical researcher obtains a sample of adults suffering from diabetes. She randomly assigns 95 people to a treatment group and 95 to a placebo group.

The treatment group receives a medication over a period of three months and the placebo group receives a placebo over the same time frame. At the end of three months the patients symptoms are evaluated. A) experiment B) observational study