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Software Output

Summary data from the previous example

 

Margin of Error for Proportions

 

n = 500   Proportion = 0.23   Standard Error = 0.0188

 

                                          Margin Limits

Confidence      Error +/-             Lower             Upper

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

    90%             0.0311           0.1989           0.2611

    95%             0.0369           0.1931           0.2669

    99%             0.0486           0.1814           0.2786

 

Summary Table of Margin of Errors for each proportion

(converted to %)

 

The promotion system is …

Staff

+/- Margin of Error

95% CI

Fair

50%

9.8%

40.2% - 59.8%

Sometimes Fair

30%

8.9%

21.0% – 38.9%

  Not Fair

    20% 

7.8%

12.2% – 27.8%

Count (n)

100

 

 

Interpretation

   I am 95% confident the percent of all staff in the population who believe the promotion system is not fair is between 12.2% to 27.8%. 

 


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