# Lesson 4 / R Lab v1.0 / Student kit

This is an original independent tutoring lesson, NOT an official UCL lesson or exam.
Student's actual UCL module is not verified. All 12 rows are fictional.
Base R only; no new packages needed.

## Start
1. Extract the ZIP, keeping data/ and scripts/ folders intact.
2. Set RStudio working directory to the ZIP's extracted root folder.
3. Run `file.exists("data/class_synthetic.csv")` — it should be TRUE.
4. Run `source("scripts/check_setup.R")`.
5. Run `source("scripts/lesson04_demo.R")` for 4 sample graphics.
6. Open scripts/lesson04_practice.R and complete TODO tasks.
7. Run `source("scripts/acceptance_test.R")` for numeric/plot/source checks.

Expected messages ONLY if real RStudio execution succeeds:
R LAB LESSON 4 SETUP CHECK PASS
R LAB LESSON 4 ACCEPTANCE TEST PASS

## Package contents
index.html, workbook.html, cheatsheet.html, cheatsheet.md, worksheet.md,
README.md, data/class_synthetic.csv, and four scripts:
lesson04_demo.R, lesson04_practice.R, check_setup.R, acceptance_test.R

Teacher answer keys are stored privately in Divan, not in this public ZIP.
All graph interpretations are descriptive, not causal or inferential.