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2 04)(10 pts.) 5. A standardized test was administered to thousands of pupils with a mean score of 85 and standard deviation of 8. A

2 04)(10 pts.) 5. A standardized test was administered to thousands of pupils with a mean score of 85 and standard deviation of 8. A random sample of 50 pupils were given the same test and showed an average score of 83.20.Is there evidence to show that this group has a lower performance than the ones in general at a 0.05 level. (15 pts.) B

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