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Unformatted text preview: 90% confidence that students preferred the popcorn from one of the size bags to the other. This conclusion was confirmed by the fact that the no preference proportion of 50%, was one of the possible values of the 90% confidence interval for the true proportion of students who preferred the snack-size bags. The confidence interval conveys that we can be 90% confident that the true proportion of students who prefer the popcorn in the snack-size bag is between 36% and 64%. The margin of error for the confidence interval is 14%. If you desire a 3% margin of error, you would need to redo the experiment and increase the sample size from the existing 36 people to 900 people....
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- Spring '08