C04 · Lesson 4 of 22 · 16 min · 6 hands-on tasks

Sampling and Confidence Intervals

Halden's adverts promise customers "save $1,500 a year". Kofi can't ask all 4,000 customers, so he asks a random 100. How close is a sample's average to the truth? Build confidence intervals, watch 100 of them try to catch the real answer, and see how sample size shrinks the uncertainty.