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WAEC Further Mathematics 2026 Question 28

Question 28

Statistics

If r denotes a correlation coefficient, which of the following expressions is false?

  1. A.r = −0.85
  2. B.0.4 ≤ r ≤ 0.9
  3. C.−1 ≤ r ≤ 1
  4. D.r = 1.05
Show the answer and explanation

Answer: D (r = 1.05)

Explanation

A correlation coefficient always lies between −1 and 1, so r = 1.05 is impossible.