Module 2 Summary: Variables, Measurement, Samples, and Bias

What You Practised

You practised how to identify units, variables, samples, populations, missing evidence, and likely bias.

Keep These Ideas

• The unit of analysis is the thing each row describes.
• Variable type decides which summaries and comparisons are suitable.
• A sample can be biased even when every recorded value is correct.

Writing Habit

The table describes the learners who responded and have recorded scores; it may not represent learners who skipped the survey or missed the exam.

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.