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Difference of Proportion Calculator HelpThe Difference of Proportion Calculator determines the probability that two percentages from separate samples are statistically different.For example, a total sample size of 240 includes 140 boys and 100 girls. Survey results show that 70% of boys engage in after-school sports activities, and 50% of girls do. Use the calculator to determine the probability that boys are more likely to participate in after-school sports than girls. In the example shown below, the number of boys (140) is entered in the first cell. The percentage of boys participating in sports (70%) is entered in the cell to the right as a decimal (.7). The number of girls (100) and the corresponding percentage (50%) written as a decimal (.5) are entered in the "Group 2" cells. Click on the "Submit" button: The Results cell will generate text defining whether the compared populations' responses are not significant, approach significance, or are significant: Note: The calculator
refers to the difference as "Z". If
the calculator
reports the difference as "significant," it means that the difference
has a 95% or greater chance of being real. If the calculator reports
the difference as "approaching significance," it means that the
difference has a 90% to 94% chance of being real.
 To use the calculator for a new comparison, enter the new number of respondents and percentages of responses in the appropriate cells, and click the Submit button again. Note: Javascript
MUST be enabled for the calculator page to function properly.
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