Question: Mean Standard Deviation N Lower class 11.36 2.96 121 Working class 12.73 2.79 676 Middle class 14.40 3.04 636 Upper class 15.49 2.95 53 The

Mean

Standard Deviation

N

Lower class

11.36

2.96

121

Working class

12.73

2.79

676

Middle class

14.40

3.04

636

Upper class

15.49

2.95

53

The 2008 GSS provides these statistics above for the average years of education for lower-, working-, middle-, and upper-class respondents and their associated standard deviations.

Construct the 95% confidence interval for the mean number of years of education for lower-class and middle-class respondents

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