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A random sample of the test scores of 100 applicants for college entry at a large junior college showed a mean score of 72.6. Determine a 99%, 95%, and 90% confidence interval for the m
mean score of all applicants at the
junior college. Assume the standard deviation of test scores is 10.5.

PTS Confidence interval
4 1. 99% confidence level x
4 2. 95% confidence level x
4 3. 90% confidence level x

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