QBA201 lecturesLectures 20–21 · Shi Qiu · Fall 2026
Lecture slide

The z Test and Decision Errors

Lectures 20–21 · 21 slides

One mean with a known population SD, one proportion, two independent means, and two independent proportions. Each case uses the normal reference.

Each slide has a spoken explanation. Pause whenever you want to calculate or discuss.

Starting the narration enables automatic slide advance. Use Explore graph when it appears to change a value and see what happens.

Transcript