Mathematics, 22.07.2021 16:40 DraeDrae138

25 scores from all of the students who took the test. She sees that the mean score is 134 with a standard deviation of 6.0547. The superintendant wants to know if the standard deviation has changed this year. Previously, the population standard deviation was 13. Is there evidence that the standard deviation of test scores has decreas

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25 scores from all of the students who took the test. She sees that the mean score is 134 with a sta...