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Comparison of Two Proportions by Sultan Z test comparison of two proportions: To compare two proportions the best software you can use is MedCalc. It easily  calculates from inputting only four Numbers.First calculate percentage for your data. Then run Medcalc software. From Menu Select: Test ·                      Comparison of two Proportions                 In the box enter data for the 1st set.   D ata in percentage:   Proportions %:  _79 Enter the Number of cases (pop) for the 1st set of D ata: Number of cases:_120       Enter the Data for the second using same Method         In the box enter data for the 2nd set. D ata in percentage: P roportions %:     _65       Enter the Number of cases (pop) for the 2nd set of data: Number of cases:_135 Press the Test button. It will look like this If the result is less than 0.05 then there is significant differen