S1.2.4 - Skewness

Skewness.; Concepts of outliers.; Students may be asked to illustrate the location of outliers on a box plot.; Any rule to identify outliers will be specified in the question.

Use skewness to connect the rule to the data and decision in the question.

This matters because skewness determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply skewness to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: Skewness is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.