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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A differential count of white blood cells from a patient gave the absolute number of lymphocytes as 8000 per mm3 and the total number of blood cells as 12,000 per mm3
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Test the claim that herbal remedies affect the number of days with fever. Do not assure the population standard deviation are equal. Based on these results, do herbal remedieis appear to be effective?
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the results of a district spelling bee for both girls and boys are normally distributed. the 60 girls have a mean score of 71 with a standard deviation of 6, while the 50 boys have a mean score of 66 points with standard deviation of 5 points. tho
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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