Assume that all variable are approximately

Chapter 7, Problem 13E

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QUESTION:

Problem 13E

Assume that all variable are approximately normally distributed.

Students per Teacher in U.S. Public SchoolsThe national average for the number of students per teacher for all U.S. public schools is 15.9. A random 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?

Source: World Almanac

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QUESTION:

Problem 13E

Assume that all variable are approximately normally distributed.

Students per Teacher in U.S. Public SchoolsThe national average for the number of students per teacher for all U.S. public schools is 15.9. A random 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?

Source: World Almanac

ANSWER:

Answer

Step 1 of 1

(a)

The national average for the number of students per teacher in U.S. is 15.9.

We have given a random sample of 12 school districts.

The mean number of students per teacher was 19.2 with a variance of 4.41.

We are asked to estimate the true mean number of students per teacher with 95% confidence.

How does your estimate compare with the national average?

We have given

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