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Author Question: A researcher obtained a random sample of 100 smokers and a random sample of 100 nonsmokers. After ... (Read 42 times)

abarnes

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on: Jul 24, 2018
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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Reply #1 on: Jul 24, 2018
Answer to Question 1

A

Answer to Question 2

A


abarnes

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Reply #2 on: Jul 24, 2018
TY


joechoochoy

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Reply #3 on: Jul 24, 2018
You're welcome


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