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Summary data from previous example

 

 Margin of Error for Means

 

n = 30   Mean = 19.5   Standard Deviation = 1.2

 

                                         Margin Limits

Confidence      Error +/-             Lower             Upper

------------------------------------------------------------

    90%           0.3723          19.1277          19.8723

    95%          0.4481          19.0519          19.9481

    99%           0.6039          18.8961          20.1039   

 

 

         You are 95% confident that the actual mean age of the all incoming freshmen will be somewhere between 19 years (the lower limit) and 20 years (the upper limit) of age. Note that both measures are rounded.


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