# Lesson 6: Final student submission checklist

- [ ] I extracted the ZIP while keeping data/, scripts/ and templates/.
- [ ] I set the RStudio working directory to the extracted root folder.
- [ ] I left the original synthetic CSV unchanged.
- [ ] I checked the dimensions, data types, NA counts and complete pairs.
- [ ] I used an NA-safe filter for scores >= 70.
- [ ] I created group, valid_n, mean_score with correct denominators.
- [ ] I drew a labelled group boxplot and labelled hours–score scatterplot.
- [ ] I used matching pairs for the scatterplot.
- [ ] I fixed at least six mistakes in a COPY of debug_challenge.R.
- [ ] I wrote my own 120–160-word English report.
- [ ] I included numerical findings and at least two limitations.
- [ ] I made no unsupported causal claim.
- [ ] My finished R code runs again from a clean RStudio session.

Submission: completed analysis_starter.R, corrected debug_challenge.R,
completed report_template.md, optionally saved charts.