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
Worldwide Variations in Population and Income Levels Developed countries represent only 18% of the
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A medical assistant holds a specimen container to receive a biopsy sample.
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World population density