Which formula is commonly used to determine the appropriate sample size when the population size is large or unknown?

Understand the Problem

The question is asking which formula is used to determine the appropriate sample size for a population when the size of that population is either large or unknown. It presents multiple-choice options for the user to select from.

More Information

Cochran's formula is widely used to calculate sample sizes where the population size is large or unknown. It accounts for desired confidence levels and estimation precision.

Tips

A common mistake is confusing Cochran's with other formulas like Slovin’s, which is simpler but less precise for unknown population sizes.

Sources

• Determine Sample Size - Qualtrics - qualtrics.com
• Statistics How To - statisticshowto.com