READ_ONLY_ACCESS
[
  {
    "id": "stats1-w04-000",
    "front": "Week 4 Diagnostic: What is the possible range of values for Pearson's correlation coefficient r?",
    "back": "Answer: B — Pearson's r is always bounded between -1 and +1 inclusive, where -1 indicates perfect negative linear correlation and +1 indicates perfect positive linear correlation."
  },
  {
    "id": "stats1-w04-001",
    "front": "Week 4 Diagnostic: If variables X and Y have a correlation coefficient r = 0, does that guarantee they are completely independent?",
    "back": "Answer: B — Pearson's r only measures linear relationships. Two variables can have a strong nonlinear relationship (e.g., Y = X^2 on [-1, 1]) and still yield r = 0."
  }
]