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Author Question: A researcher obtained a random sample of 100 smokers and a random sample of 100 nonsmokers. After ... (Read 112 times)

abarnes

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A researcher obtained a random sample of 100 smokers and a random sample of 100 nonsmokers.
 
  After interviewing all 200 participants in the study, the researcher compared the rate of depression among the smokers with the rate of depression among nonsmokers. A) observational study B) experiment

Question 2

Assume that the random variable X is normally distributed, with mean  = 100 and standard deviation s = 20. Compute the probability P(X > 116).
 
  A) 0.2119 B) 0.1977 C) 0.7881 D) 0.2420



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joechoochoy

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Answer to Question 1

A

Answer to Question 2

A





 

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