Question: 21. A standardized test is given annually to all sixth-grade students in the state of Washington. To determine the average score of students in her

21. A standardized test is given annually to all sixth-grade students in the state of Washington. To determine the average score of students in her district, a school supervisor selects a random sample of 100 students. If the sample mean of these students’ scores is 320 and the sample standard deviation is 16, give a 95 percent confidence interval estimate of the average score of students in that supervisor’s district.

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