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Q.10

Expert-verifiedFound in: Page 477

Book edition
OER 2018

Author(s)
Barbara Illowsky, Susan Dean

Pages
902 pages

ISBN
9781938168208

If the Census wants to increase its level of confidence and keep the error bound the same by taking another survey, what changes should it make?

If the Census wants to increase its level of confidence and keep the error bound the same by taking another survey, than they should increase the sample size $n$.

The sample mean is $8.2$ minutes. There is a known standard deviation of $2.2$ minutes. The population distribution is assumed to be normal.

A tighter confidence interval with a smaller margin of error will arise from a bigger sample size or lower variability. A wider confidence interval with a larger margin of error will arise from a smaller sample size or higher variability.

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