Roadmap
Day 31 · Sampling 40 min 30 XP
🧪Populations and samples
You almost never see every customer, every order or every visit. You see a slice and have to say something about the whole. Statistics starts with being clear about which is which.
What you'll learn
- Tell a population from a sample
- Explain why a random sample beats a convenient one
- Measure sampling error by comparing a sample with the full data
A peek inside
Population, sample, parameter, statistic
The rest of Day 31 is a Pro lesson
You're on the free Explorer plan — you get the intro and the video. Go Pro to open the full guided lesson (and all 30 days).
- 3 deep-dive lessons
- A copy-paste worked example
- 3 hands-on practice tasks
- Studio task: Catch a biased sample red-handed
- 3-question quiz, up to 45 XP
- 4 quick-glance glossary cards
- 30 XP + streak tracking
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