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Prior to a statewide senate election, three polls are conducted concerning a particular candidate's popularity. In the first poll, 750 of 1500 voters favor the candidate. In the second poll, 1285 of 2520 favor the candidate. In the third poll, 1795 of 3500 voters favor the candidate. Find 95% confidence intervals for the proportion of voters in favor of the candidate for all three.
a) The 95% confidence interval for the first poll is ___<p < ___.
b) The 95% confidence interval for the second poll is ___<p < ___.
c) The 95% confidence interval for the third poll is ___<p < ___.
d) Does the confident interval includes values of les or more than 0.5?_____
Is there a difference in the number of points students earned on their educational statistics pretests and posttests?
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Use this information to construct a probability table, and then calculate each of the following probabilities:
What is 95% confidence interval estimate for average number of years served by all Supreme Court justices?
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Appalachian Coal mining believes it can enhance labor productivity and therefore net revenue by reducing air pollution in its mines. It estimates that the marginal cost function for reducing pollution by installing additional capital equipment is.
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