Unit project — Clean it and log it

Time: 2 periods + homework. Groups of 3 with roles: data steward, analyst/driver, storyteller (rotate).

Problem

Make the messy table trustworthy.

Plan

List every problem you see before changing anything.

Data

Messy air-quality table.

Analysis

Fix each problem; count rows before and after.

Conclusion

Write the cleaning log and one sentence on what could still be wrong.

Hand in

Cleaned file + cleaning log (original kept).

Rubric: the six-criterion four-level rubric in docs/pedagogy/assessment.md. AI help: disclose in one line.