Variability (Statistics)

Transcript

Variability (Statistics)Variability asks: Are the numbers bunched up together, or are they all over the place? We notice that Mean and the Median gives a representative value of the data As part of analysing data, It is also valuable to look at the variability in the given data, i.e., its extremes (minimum and maximum values) Let’s look at some more examples Example – Number of books read each month VARIABILITY: How Spread Out Are We? Real-Life Example: Books Read Last Month GROUP A: Similar Amounts (Low Spread) Data points are close together on the dot diagram. GROUP B: Different Amounts (High Spread) Data points are spread far apart on the dot diagram. High variability means the numbers are spread far apart!Example – Number of pencils in a class EASIER EXAMPLE: Variability = "How Spread Out?"Example – Height of students in a school