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Author Question: There are 1,237 trees on the hill. Explain how to use a random digit table to select a simple random ... (Read 295 times)

CharlieWard

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on: Jul 24, 2018
There are 1,237 trees on the hill. Explain how to use a random digit table to select a simple random sample of 20 trees.
 
  Then use the random digit table below to select the first five trees for your sample.
 
  04905 83852 29350 91397 49531 78981 81980 08530
 
  19994 65142 05087 11232 39129 49559 94540 24070

Question 2

Suppose the number of babies born each hour at a hospital follows a Poisson distribution with a mean of 4. Find the probability that exactly seven babies are born during a randomly selected hour.
 
  MULTIPLE CHOICE.
 
  Choose the one alternative that best completes the statement or answers the question.


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kmb352

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

Starting in the top row, number the trees from 0001 to 1237. Go through the table taking four digits at a time, and select the corresponding tree. Ignore repeats and numbers larger than 4237. Keep going until you have 20 distinct trees selected.

04905 83852 29350 91397  49531 78981 81980 08530

19994 65142 05087 11232 39129 49559 94540 24070

The selected trees are numbers 490, 3509, 1397, 1789, 1999

Answer to Question 2

Let x = the number of babies born during a one-hour period at this hospital.
Then x is a Poisson random variable with  = 4.

P(x = 7 ) = 0.059540


CharlieWard

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Reply #2 on: Jul 24, 2018
Thank you!


kmb352

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Reply #3 on: Jul 24, 2018
Always glad to help...


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