Question: Use the data on education from Chapter 6, Exercise 5. a. Construct the 95% confidence interval for the mean number of years of education for

Use the data on education from Chapter 6, Exercise 5.

a. Construct the 95% confidence interval for the mean number of years of education for lower-class and middle-class respondents.
b. Construct the 99% confidence interval for the mean number of years of education for lower-class and middle-class respondents.
c. As our confidence in the result increases, how does the size of the confidence interval change? Explain why this is so.

Lower class Working class Middle class Upper class Mean 11.61 12.80 14.45 15.45 Standard Deviationn 2.67 2.85 3.08 2.98 123 626 38

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