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# Finding Sample Size with Predetermined Margin of Error and Level of Confidence for a Proportion

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Author: Al Greene
##### Description:

• Demonstrate how to use the margin of error formula (z*• S ) to calculate sample size when given a predetermined margin of error and level of confidence for a one-proportion z-interval
• Review standard error for proportions.

This packet shows you the method to find the minimum required sample size when you are already given a margin of error and confidence level. We show you several examples of calculating sample sizes, and review what the standard error for proportions is.

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Tutorial

## What's in this packet

This packet covers sample size estimation for a proportion, given a margin of error and confidence level. There are no new terms in this packet.

Source: Greene

## Sample Size Estimation

This powerpoint shows you the two methods for calculating sample sizes based on predetermined margins of error.

Source: Greene

## Sample Size Proportions Statistics

This video shows how to find a desired sample size for a proportion.