Z-test for Proportions-Independent Groups
This calculator is used to compare the proportions from two independent groups (i.e. groups with no overlap between them such as men and women) to determine if they are significantly different from one another. It allows you to enter the information for as many as 10 independent groups at a time. The calculator will then perform the Z-test for every possible combination of groups.
This test assumes you have a large population.
How To Interpret The Results
For example, suppose you carried out a survey with 200 respondents and you are interested in whether there is a difference between the observed results for males (Group 1) and females (Group 2), at the 95% confidence level.
|Group 1||Group 2||Group 1||Group 2|
|Sample Size||Group 1|
|Observed Sample Proportion||Group 2|
‘NO’ indicates that there is not a significant difference between the two observed proportions, i.e. the observed proportion for males is not significantly different to the observed proportion for females.
Use the calculator above to calculate your results.