A website shows half its visitors a green button and half a blue button, then compares sign-ups. This is:

  1. A randomized experiment (A/B test)
  2. An observational study
  3. A survey
  4. A census
Answer

A) A randomized experiment (A/B test)

Random assignment to groups lets the difference be attributed to the button colour. SLO CS-11-D-02 · Understanding

Computer Science MCQ · More Unit 4: Data and Analysis MCQs · Practise