Econ 3640_002 Quiz 3_FA16

Ten years ago the mean math sat score of all high

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18. Ten years ago the mean Math SAT score of all high school students who took the exam in a small high school was 490, with a standard deviation of 80. This year, a boxplot of the scores of a random sample of 25 students in the high school who took the exam is given on the next page. The mean score of these 25 students is x = 530. We assume the population standard deviation continues to be σ = 80. To determine if there is evidence that the scores in the district have improved, the hypotheses H 0 : µ = 490, H a : µ > 490 are tested using the z statistic. With the P -value you find, it may be concluded: 0 0
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