How do I calculate sample size for my research?

How do I calculate sample size for my research?

To calculate sample size, you need to know the population size, margin of error, confidence level, and variability.

What if I don't know the population size?

If the population size is unknown, you can use a standard population size, like 30,000, for your calculations.

Can you give me an example calculation?

Sure! If you want a 5% margin of error and a 95% confidence level, you can use the formula: n = (Z^2 * p * (1-p)) / E^2.

What do Z, p, and E represent in that formula?

Z is the Z-score for your confidence level, p is the estimated proportion, and E is the margin of error.