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An online math tutor service would like to claim that the average time spent taking a standardized test after students go through tutoring is less

An online math tutor service would like to claim that the average time spent taking a standardized test after students go through tutoring is less than the average time spent before going through tutoring. A simple random sample of students takes a pre-test, then goes through tutoring and takes a post-test. Results of the sample are shown below.

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