Why is there a difference
A survey of 1600 Democrats and 900 Republicans (all randomly selected) showed at 90% confidence a margin of error of +- 2 for Democrats and +- 3 for Republicans. Why is there a difference?
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What is the average improvement on the scores after taking the course? At 90% confidence using the critical value approach, test to see if taking the course actually increased scores on the driving exam.
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create a temporary committee to investigate the cause of the recent werewolf attacks in major cities throughout the United States.
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