Author note — to cover

Classify quantitative data as discrete (counted, moving in steps) or continuous (measured, any value in a range), with shoe size the classic discrete trap despite fractional values. Classification and explain-why questions only; grouping continuous data into inequality classes lives on Grouped frequency tables. Both tiers. (S2, S4)

Introduction

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Practice and continue

Practice

Discrete and continuous data

Counts that move in steps against measurements that can take any value.

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Primary and secondary data

Data collected yourself against someone else's records, and what each costs.