Assume that the random variable X is normally distributed, with mean = 60 and standard deviation = 16. Compute the probability P(X < 80).
A) 0.8944 B) 0.8849 C) 0.1056 D) 0.9015
Q. 2According 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
Q. 3A 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
Q. 4A national caterer determined that 87 of the people who sampled their food said that it was delicious. A random sample of 144 people is obtained from a population of 5000. The 144 people are asked to sample the caterers food.
Will the distribution of p , the sample proportion saying that the food is delicious, be approximately normal? Answer Yes or No. A) Yes B) No
Q. 5True or False: Residual analysis cannot be used to check for outliers.
A) False B) True
Q. 6According to government data, the probability that an adult was never in a museum is 15. In a random survey of 10 adults, what is the probability that at least eight were in a museum?
A) 0.820 B) 0.200 C) 0.002 D) 0.800
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