Quiz — Lecture 26

Section A from memory, one line each. Section B shows your reasoning - marks are for method, not final answers. Answers are discussed in class; the exit ticket goes on a card.

Section A

A1. What does a frequency table add to raw anecdotes?

A2. P(A|B) vs P(B|A): what differs?

A3. Define independence operationally.

A4. State the complement rule.

Section B

B1. Delays: 7 of 14 under 3 minutes - verdict on 'usually under 3'?

B2. 100 sessions, 40 mobile, 10 double-click, 8 both: both conditionals.

Exit ticket

Answer one of these on your card in 60 seconds (choose any one):

1. What is a base rate and what does it do to PPV?

1. When may two events not be multiplied?

1. What did simulation add to the streak question?

Homework

• Before: skim the four student pages; attempt case 1 on paper.
• After: write a five-line pseudocode solution for any case you did not
• Enrichment (optional): the stretch question on each case page.