Your course
Lessons in your lecturer’s order, with your lecturer’s symbols.
Lessons follow your lecturer’s order and symbols.
A test is 99% accurate, but only 1 in 1,000 people have the condition. Bayes’ theorem says to start from that rarity, then update on the result.
Slide 18 runs it on 10,000 people: nearly all of the 10 who have it test positive, and so do 1% of the other 9,990, about 100 more. Of about 110 positives, only 10 are real.
| Have the condition | 10 | 9% |
| Don’t, flagged by mistake | 100 | 91% |
| Total | 110 | 100% |
Illustrative numbers, not real data.
The real thing, not a picture of it. Try it.
01
If your course writes vectors in bold or uses $\mathbf{x}^\top$, so do your lessons.
02
Lessons follow the order your course teaches in, so they line up with the week you’re in.
03
Terms are the ones your lecturer uses, so the exam reads like your lessons.