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. 

Concepts

sample size, proportions

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Additional Tags

math

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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

• This video is hosted on YouTube

Pros

• Step-by-step instructions are easy to follow

Cons

• Includes only one sample problem

Common Core

HSS-IC.B.4