Mean Standard Deviation N Lower class 12.19 3.08 102 Working class 13.16 2.93 523 Middle class 14.60 2.88 498 Upper class 15.21 3.01 34 Construct the 95% confidence interval for the mean number of years of education for lower- and working-class respondents. Construct the 99% confidence interval for the mean number of years of education for lower-

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