A tutoring center advertised it could raise a student s college entrance exam score by...
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A tutoring center advertised it could raise a student s college entrance exam score by 10 points A random sample of 50 students had a mean increase of 8 points with a standard deviation of 5 points Using the table below find the 99 confidence interval O 6 18 to 9 82 O 6 84 to 9 16 6 614 to 9 39 6 20 to 9 84 Confidence Level as a percent 90 95 99 z value 1 645 1 960 2 576
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