Week 2 Concept Check — CRISP-DM, no code

No coding here — just reasoning. Work through each question, then press Check to see how you did and why. Nothing is saved; do it as many times as you like.

Question 1

In the water-quality case, failures jumped from ~6% to ~25% in May — the same month the testing switched from the Municipal lab to the Regional lab. What do we call a third thing (the lab change) that moves together with both?

A coincidence A confound An outlier A sample

Question 2

You decide to drop the August row because it had 0 samples taken. Which CRISP-DM phase are you in?

Business Understanding Data Preparation Modelling Deployment

Question 3

Which framework starts at 'Sample' and ends at 'Assess' — with no phase for the business question up front or acting on the result at the end?

CRISP-DM SEMMA The KDD Process

Question 4

Put the six CRISP-DM phases in the order you'd normally do them.

Business Understanding
Data Understanding
Data Preparation
Modelling
Evaluation
Deployment

Question 5

Match each term to its meaning.

CRISP-DM Confound fail_rate Deployment

Question 6

August recorded 0 samples taken and 0 samples failing. Does it follow that the water was 0% failing that month?

Yes No

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