Module 7 Summary: Sampling Variation and Confidence Intervals

What You Practised

You practised how to interpret estimates with uncertainty ranges instead of false precision.

Keep These Ideas

• A statistic describes the sample.
• A parameter is the unknown value in the wider population.
• A confidence interval gives a reasonable range for the unknown value under the method used.

Writing Habit

The sample completion rate is 68%, and the uncertainty range suggests the wider completion rate may plausibly be around 61% to 75%.

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.