Module 3 Summary: Counts, Rates, Percentages, and Proportions

What You Practised

You practised how to compare counts only after checking the denominator.

Keep These Ideas

• A count tells how many events happened.
• A rate or percentage needs a denominator.
• Small counts can move percentages sharply, so sample size matters.

Writing Habit

Basic had more tickets in March, but Pro had a higher ticket rate per active account.

Before Moving On

You are ready for the next module when you can explain the module idea without reading the answer key and can name the main unsafe claim to avoid.