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July 28, 2015

Homework Help: statistics

Posted by ali awan on Wednesday, May 8, 2013 at 3:42pm.

10.
Using the results of a Newsweek poll conducted in March of 2009, a 90% confidence interval on the proportion of adult Americans who have a favorable opinion of Barack Obama is given by (0.699, 0.741). If everything else is the same, but the confidence level increases, what happens to the width of the confidence interval?
A)
It decreases.
B)
It increases.
C)
It does not change.

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