Roadmap
Day 34 · Uncertainty 47 min 40 XP
🎯Confidence intervals in plain words
A sample average is a guess. A confidence interval turns the guess into an honest range: 'probably between here and here'. It is the most useful way to report uncertainty.
What you'll learn
- Explain what a 95% confidence interval does and does not say
- Build one with CONFIDENCE.NORM and CONFIDENCE.T
- See how sample size changes the width
A peek inside
Estimate plus margin of error
The rest of Day 34 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: Build and read two intervals
- 3-question quiz, up to 45 XP
- 4 quick-glance glossary cards
- 40 XP + streak tracking
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