99% confidence interval for the mean number of years of education for lower-class respondents?    11.44 to 12.78    5.72 to 6.39    13.55 to 14.89    22.88 to 25.56

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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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 lower-class respondents? 

 
  1. 11.44 to 12.78 

     
  2. 5.72 to 6.39 

     
  3. 13.55 to 14.89 

     
  4. 22.88 to 25.56

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