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Author Question: A researcher determined the size sample necessary to estimate two population means Y and Z. The ... (Read 79 times)

V@ndy87

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on: Jun 29, 2018
A researcher determined the size sample necessary to estimate two population means Y and Z. The indicated sizes were 200 to estimate Y and 300 to estimate Z with the specified degrees of confidence and precision. The researcher decided therefore to use a sample of size 250 . Assuming the estimates of the population standard deviation were correct
 a. the estimate of Y is more precise than desired while that for Z is less precise than desired.
  b. the estimate of Y is less precise than desired while that for Z is more precise than desired.
  c. Y is estimated with exactly the specified degree of precision while Z is estimated less precisely than desired.
  d. Z is estimated with exactly the specified degree of precision while Y is estimated less precisely than desired.
  e. Both Y and Z are estimated with the exact specified degree of precision.

Question 2

If the sample standard deviation turns out to be larger than the estimated population standard deviation, the confidence interval to estimate a population mean will be __________ planned.
 a. Narrower than
  b. Wider than
  c. The same as
  d. As precise as
  e. None of the above


ndhahbi

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Reply #1 on: Jun 29, 2018
Answer to Question 1

a

Answer to Question 2

b


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