Podcast
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) / ?^2 (correct)
- n = Z^2 * ? / E
- n = E / Z
- n = Z / E
What is the Z-score for a 95% confidence level?
What is the Z-score for a 95% confidence level?
- 2.576
- 1.96 (correct)
- 1.645
- 0.025
If the population standard deviation is unknown, what should be done when estimating the sample size?
If the population standard deviation is unknown, what should be done when estimating the sample size?
- Use the Z-score as the standard deviation
- Conduct a pilot study to get an idea of the variability (correct)
- Ignore the standard deviation
- Use the sample variance as the standard deviation
What is the margin of error (E) in a sample size calculation?
What is the margin of error (E) in a sample size calculation?
When should you use a finite population correction factor in sample size estimation?
When should you use a finite population correction factor in sample size estimation?
If you want to increase the confidence level in a sample size calculation, what happens to the required sample size?
If you want to increase the confidence level in a sample size calculation, what happens to the required sample size?
What effect does an increase in margin of error have on the required sample size?
What effect does an increase in margin of error have on the required sample size?
What does a Z-score represent in a sample size calculation?
What does a Z-score represent in a sample size calculation?
What component can be used as an estimate if the population standard deviation is unknown?
What component can be used as an estimate if the population standard deviation is unknown?
In which scenario should you round up to the nearest whole number when calculating sample size?
In which scenario should you round up to the nearest whole number when calculating sample size?
