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redrider89 redrider89
wrote...
Posts: 531
Rep: 4 0
6 years ago
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. 2

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

Q. 3

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

Q. 4

A 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. 5

True or False: Residual analysis cannot be used to check for outliers.
 
  A) False B) True

Q. 6

According 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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trissy15trissy15
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Posts: 350
Rep: 2 0
6 years ago
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redrider89 Author
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6 years ago
Helped a lot
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Thanks
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2 hours ago
Brilliant
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