A 90 percent confidence interval is to be created to estimate the proportion of television viewers in a certain area who favor moving the broadcast of the late weeknight news to an hour earlier than it is currently. Initially, the confidence interval will be created using a simple random sample of 9,000 viewers in the area. Assuming that the sample proportion does not change, what would be the relationship between the width of the original confidence interval and the width of a second 90 percent confidence interval that is created based on a sample of only 1,000 viewers in the area? (A) The second confidence interval would be 9 times as wide as the original confidence interval. (B) The second confidence interval would be 3 times as wide as the original confidence interval. (C) The width of the second confidence interval would be equal to the width of the original confidence interval. (D) The second confidence interval would be 13 as wide as the original confidence interval. (E) The second confidence interval would be 19 as wide as the original confidence interval.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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例题5:
A 90 percent confidence interval is to be created to estimate the proportion of
television viewers in a certain area who favor moving the broadcast of the late
weeknight news to an hour earlier than it is currently. Initially, the confidence interval
will be created using a simple random sample of 9,000 viewers in the area. Assuming
that the sample proportion does not change, what would be the relationship between
the width of the original confidence interval and the width of a second 90
confidence interval that is created based on a sample of only 1,000 viewers in the
percent
area?
(A) The second confidence interval would be 9 times as wide as the original
confidence interval.
(B) The second confidence interval would be 3 times as wide as the original
confidence interval.
(C) The width of the second confidence interval would be equal to the width of the
original confidence interval.
(D) The second confidence interval would be 13 as wide as the original confidence
interval.
(E) The second confidence interval would be 19 as wide as the original confidence
interval.
Transcribed Image Text:例题5: A 90 percent confidence interval is to be created to estimate the proportion of television viewers in a certain area who favor moving the broadcast of the late weeknight news to an hour earlier than it is currently. Initially, the confidence interval will be created using a simple random sample of 9,000 viewers in the area. Assuming that the sample proportion does not change, what would be the relationship between the width of the original confidence interval and the width of a second 90 confidence interval that is created based on a sample of only 1,000 viewers in the percent area? (A) The second confidence interval would be 9 times as wide as the original confidence interval. (B) The second confidence interval would be 3 times as wide as the original confidence interval. (C) The width of the second confidence interval would be equal to the width of the original confidence interval. (D) The second confidence interval would be 13 as wide as the original confidence interval. (E) The second confidence interval would be 19 as wide as the original confidence interval.
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