A psychology professor at a certain college gave a test to the students in her class. The
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A psychology professor at a certain college gave a test to the students in her class. The test was designed to measure students’
attitudes toward school, with higher scores indicating a more positive attitude. There were 30 students in the class, and their mean score was 78.
Scores on this test are known to be normally distributed with a standard deviation of 10.
Explain why these data should not be used to construct a confidence interval for the mean score for all the students in the college.
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