To write
TODO: The opening.
▦Activity
An activity and two check questions, the shape Parts 1 and 2 use. The idea for this part is committing to what you expect before the answer appears, so the gap between the guess and the result is where the student's attention lands.
▤Lesson
The teaching content for this part goes here, between getting a feel for the idea and doing it for real. What form it takes is still open. A recorded walkthrough, written explanation on this page, worked examples the student modifies, or nothing beyond the job statement and an empty notebook.
To write
The job statement for this part, the way Parts 1 and 2 state theirs.
⌘Notebook
The notebook for this part, opening in Colab the way Part 2's does. It loads the course's cleaned file, the output of Part 3, so everyone analyzes identical data.
▶Video
The practitioner. The most valuable recording in the module. A time missing data turned out to mean something: how they worked out which kind of missing it was, and who they asked.
To write
The two comparisons the student makes against the recording, chosen for this part.