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The national average for the number of students per teacher

The national average for the number of students per teacher for all U.S. public schools is 15.9.Arandom sample of 12 school districts from a moderately populated area showed that the mean number of students per teacher was 19.2 with a variance of 4.41. Estimate the true mean number of students per teacher with 95% confidence. How does your estimate compare with the national average?

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