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# How to Calculate Sample Size Proportions

Have you ever wondered about the proportion of ducks it would take to equal one bear's weight? (It's 423.) The video walks through how to solve for sample size when you already know the confidence, error, and proportion. It also graphs the relationship between proportion and sample size.

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CCSS:
Adaptable

##### Instructional Ideas

- Have sample problems ready to complete after watching the video

##### Classroom Considerations

- Assumes prior knowledge of how to solve equations
- Lesson requires a full understanding of confidence, error, and proportion
- The second in a series of six videos

##### Pros

- Step-by-step instructions are easy to follow

##### Cons

- Includes only one sample problem

##### Common Core

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