How do I calculate the sample size for my study?
An example of an AI chatbot conversation about sample size calculation for research studies.
How do I calculate the sample size for my study?
To calculate the sample size, you need to know the population size, margin of error, confidence level, and the expected proportion.
What if I don't know the expected proportion?
If you don't know the expected proportion, you can use 0.5 as a conservative estimate, which maximizes the sample size.
Can you give me a formula for the sample size calculation?
Sure! The formula is: n = (Z^2 * p * (1-p)) / E^2, where Z is the Z-value, p is the expected proportion, and E is the margin of error.
What is a Z-value?
The Z-value corresponds to the confidence level you choose. For example, a 95% confidence level has a Z-value of 1.96.
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