Why are Degrees of Freedom (n-1) Used in Variance and Standard Deviation

Don't be mean, be above average. A straightforward video explains why degrees of freedom are used and how to recognize the error based on your sample population. 

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CCSS: Adaptable
Instructional Ideas

  • Lecture would work well for homework in a flipped classroom
Classroom Considerations

  • Pupils should already be familiar with figuring standard deviation before the lesson
  • Be sure to follow the lesson with more direct instruction, as the video might leave some pupils confused
  • The second in a series of seven statistics videos
Pros

  • Demonstrates one guided practice problem step by step
Cons

  • Does not clearly explain why mathematicians use degrees of freedom