What is the sample size formula?
An example of an AI chatbot conversation about calculating sample sizes for research.
What is the sample size formula?
The sample size formula is typically represented as n = (Z^2 * p * (1-p)) / E^2, where n is the sample size, Z is the Z-value, p is the estimated proportion, and E is the margin of error.
Can you explain what each component means?
Sure! Z is the Z-value from the standard normal distribution, p is the estimated proportion of the population, and E is the margin of error you are willing to accept.
How do I determine the Z-value?
The Z-value corresponds to the confidence level you want. For example, a 95% confidence level has a Z-value of approximately 1.96.
What if I don't know the population proportion?
If you don't know the population proportion, you can use 0.5 as a conservative estimate, which maximizes the sample size.
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