Class Mean Standard Deviation N Lower 12.11 2.83 122 Working 13.01 2.91 541 Middle 14.99 2.93 475 Upper 15.44 2.83 34 What is the 99% confidence interval for the mean number of years of education for middle-class respondents? 18.65 to 19.33 4.65 to 5.33 7.33 to 7.67 14.65 to 15.33

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.

Class

Mean

Standard Deviation

N

Lower

12.11

2.83

122

Working

13.01

2.91

541

Middle

14.99

2.93

475

Upper

15.44

2.83

34

What is the 99% confidence interval for the mean number of years of education for middle-class respondents? 

 
  1. 18.65 to 19.33 

     
  2. 4.65 to 5.33 

     
  3. 7.33 to 7.67 

     
  4. 14.65 to 15.33

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