Y1 Statistical Measures

You need to be confident with calculating, representing and interpreting measures of Central Tendency and Variation

Central Tendency

These include Mean, Median, Mode, Quartiles and Percentiles

Variation (spread)

Measurements that show how much data is spread out are Range, Inter-Quartile Range, Standard Deviation and Variance.

A-Level questions typically will ask you to make interpretations of sets of data. This is often where marks are lot. It is not enough to be able to calculate a standard deviation from a set of data without being able to interpret the meaning of it in a particular context.

It is useful to keep 2 things in mind and to make sure that you use the EVIDENCE to make MEANING:

EVIDENCE: What values will I need to calculate and what comparisons will I make?

MEANING: What does this mean in the context of the question?

Videos

This set of videos has everything you need to know.

All topics

Interpolation for median

Interpolation for quartiles