Author note — to cover (Higher)

Read P(A given B) from a completed two-way table as the named cell over the row or column total the condition fixes, never the grand total; contrast P(A given B) with P(B given A) from the same table. Higher tier only. Completing the table is both-tier work on two-way-tables (Diagrams topic). (P9)

Introduction

—coming soon—

Practice and continue

Practice

Conditional probability from a two-way table

P(A given B) as a cell over its row or column total, not the grand total.

Next lesson

Conditional probability from a Venn diagram

Dividing the overlap by the region in the condition, not the whole diagram.