question archive Stewart reports is a political polling company that has been criticized by others in the polling industry for being biased favorably towards democrats
Stewart reports is a political polling company that has been criticized by others in the polling industry for being biased favorably towards democrats
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Stewart reports is a political polling company that has been criticized by others in the polling industry for being biased favorably towards democrats. To test whether this is true , a researcher looks at every political race the Stewart Reports predicted for the 10 years. In each race the difference between predicted and actual percent of votes recieved by the democrats candidates was calculated as X stewart -Xactual. The mean of the difference was calculated. What should be the null and alternative hypothesis to test whether on average, Stewart was over predicting democrat support?
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The null hypothesis is that the mean difference is equal to 0. There is no difference between the actual mean and the predicted mean.
The alternative hypothesis is that the mean difference is greater than 0. The mean prediction exceeded the actual mean.
