SAMPLE SIZE CALCULATORS
You will need at least respondents.
TWO EQUAL SAMPLES
Each sample must contain at least respondents.
The size of the first sample is.
The size of the second sample is.
How small a difference between the samples around 50% can I detect at the
You can detect a difference of at least %.
Note: 50% is the hardest test. With these samples, you can detect smaller differences around other percentages.