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Questions and Answers
What is the formula to calculate the required sample size?
What is the formula to calculate the required sample size?
- n = E^2 / Z^2 * σ^2
- n = Z^2 * E^2 / σ
- n = Z^2 * σ^2 / E^2 (correct)
- n = Z * σ / E
In the context of estimating sample size, what does 'Z' represent?
In the context of estimating sample size, what does 'Z' represent?
- Margin of error
- Sample standard deviation
- Z-score for confidence level (correct)
- Population size
For a 95% confidence level, what is the Z-score typically used?
For a 95% confidence level, what is the Z-score typically used?
- 1.96 (correct)
- 2.576
- 0.05
- 1.645
What is the purpose of conducting a pilot study when estimating sample size?
What is the purpose of conducting a pilot study when estimating sample size?
When estimating sample size, what should be done if the sample is more than 5% of the population?
When estimating sample size, what should be done if the sample is more than 5% of the population?
In the formula n = (N-1)E^2 + Z^2σ^2 / (Z^2*N-1), what does 'N' represent?
In the formula n = (N-1)E^2 + Z^2σ^2 / (Z^2*N-1), what does 'N' represent?
What should you do if you end up with a fraction for the calculated sample size?
What should you do if you end up with a fraction for the calculated sample size?
'Population Standard Deviation' is used in estimating sample size when:
'Population Standard Deviation' is used in estimating sample size when:
What factor is applied to adjust sample size if it exceeds 5% of the population?
What factor is applied to adjust sample size if it exceeds 5% of the population?
What does 'Z' represent in the context of estimating sample size?
What does 'Z' represent in the context of estimating sample size?
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