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Mean Number of Years of Education by Class Mean St Dev N Working class 12.8 2.85 697 Middle class 14.45 3.08 626 Using the above

Mean Number of Years of Education by Class

Mean

St Dev

Working class

12.8

2.85

697

Middle class

14.45

3.08

626

Using the above data, construct a 95% confidence interval for education for both

working

AND

middle class

Now construct a 99% confidence interval for

both.

How does the size of the confidence interval change as our confidence in the results

increase?

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