Quiz — Lecture 27

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. Sort into repair / reject / flag: trailing spaces, age -3, score 92 with class mean 40.

A2. Why ship an audit trail?

A3. Name three missing-value policies.

A4. Why clean before anomaly-hunting?

Section B

B1. Bookings '9:00-9:00' and '24:00-25:00': classify each and log lines.

B2. Series 12.0, 11.5, None, None, 13.0: which policy inflates a fake crash?

Exit ticket

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

1. Why report every cleaning rule?

1. What is a false merge in cs-107?

1. When is a gap an anomaly?

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.