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Mathematics, 19.06.2020 04:57 russboys3

A Portland high school wanted to see if reading test scores have changed in the past 30 years by testing a random sample of 25 students to see whether there is a significant change from the average score of 78 thirty years ago. The sample yields a mean and standard deviation of 84 and 8 respectively. What is the unknown parameter of interest in this example?

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