The national average of students per teacher for U.S. schools is 15.9. A random sample of 12 school districts showed the
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The national average of students per teacher for U.S. schools is 15.9. A random sample of 12 school districts showed the
The national average of students per teacher for U.S. schools is 15.9. A random sample of 12 school districts showed the average number of students per teacher was 19.2 with a standard deviation of 2.1. Estimate the true mean of students with a 95% confidence. How does your estimate compare with the national average?