How do I choose the right sample size for my study?

How do I choose the right sample size for my study?

Choosing the right sample size depends on several factors, including the population size, the margin of error, and the confidence level you desire. What type of study are you conducting?

I'm conducting a survey on customer satisfaction.

For a customer satisfaction survey, a common approach is to use a sample size calculator. You need to decide on your desired confidence level (usually 95%) and margin of error (like 5%). Do you have an estimated population size?

Yes, I have about 1,000 customers.

Great! With a population of 1,000, a 95% confidence level, and a 5% margin of error, you would need a sample size of approximately 278 respondents. Would you like to know how to calculate that?

Yes, please explain the calculation.

To calculate the sample size, you can use the formula: n = (Z^2 * p * (1-p)) / E^2, where Z is the Z-score, p is the estimated proportion of the attribute present in the population, and E is the margin of error. For a 95% confidence level, Z is 1.96. Would you like to go through an example?