Confidence interval estimate for average score of students

Reference no: EM13156218

The standard deviation of test scores on a certain achievement test is 11.3. If a random sample of 81 students had a sample mean score of standard deviation of test scores on a certain achievement test is 11.3. If a random sample of 81 students had a sample mean score of 74.6, find a 90 percent confidence interval estimate for the average score of all students.

Reference no: EM13156218

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