Understand the idea
A difference between groups does not by itself prove a cause. Other conditions may differ.
WORKED EXAMPLE
In a fictional study, a group with reminders completes 18 of 20 tasks, while another completes 14 of 20. The difference is 20 percentage points; the groups may differ in other ways.
Watch it step by step
Step 1 of 4Read
Read the labels and values: Reminder: 18, Comparison: 14.
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- Read
Read the labels and values: Reminder: 18, Comparison: 14.
- Represent
Compare the bars on a scale that starts at zero.
- Calculate
Work through the calculation in the example; result: 20.
- Interpret
Explain what the result means and what it does not establish.
TRY BEFORE CHECKING
Exercises with feedback
MAKE SOMETHING YOU CAN EXPLAIN
Your practical challenge
Report both completion rates and two alternative explanations. Propose a fairer comparison.
These ticks are your self-review. They do not automatically assess project quality. Ask an adult or partner to review what you can show.
Use the skill in a new situation
Distinguish a 20 percentage-point difference from a relative percentage increase.