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Applied Statistics Handbook
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Software Output

Summary data from the previous example


Two-Sample Difference of Proportions (2-tailed)


                     School A     School B

Sample Proportion    0.23         0.07

Sample Size (n)      80           180


                     Z-statistic      p <

Significance         3.674        0.0002 




  For a 2-tailed test, the p-value represents the probability of making a type 1 error (concluding there is statistical significance when there is none).  Since there is far less than a 5% chance of making a type 1 error, you would conclude there is statistical significance.




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