Real-Life Scenarios
Text Version

(Introduction music)
Image description: Andrew and Khalid are sitting together at a table in math class. Documents and calculators are on the table. Justyce stands to the left of them.

Justyce: Did you consider using standard deviation instead of mean absolute deviation?

Image description: The boys look confused.

Khalid: What do you mean?

Image description: As Justyce speaks the definition of standard deviation appears on the screen: standard deviation, a value that describes the variation of a data set.

Justyce: There is another method for describing the variability of data. It is called the standard deviation. Just like the mean absolute deviation, the standard deviation is a value that describes the variation of a data set. In other words, it is a number that describes how far the data points are from the mean. A high standard deviation means the data values are very far apart. A low standard deviation means the data values are close together.

Image description: As Justyce describes a high standard deviation, a number line appears showing the mean in the middle of the number line and two points of equal distance above and below the mean. The points are far away from the mean. As Justyce describes a low standard deviation, the two points move closer toward the mean.