Which of the following research studies would collect nominal level data?
An experiment measuring the precise time in seconds taken to complete a complex spatial puzzle.
A questionnaire asking participants to rate their agreement with a political statement on a 5-point Likert scale (strongly agree to strongly disagree).
An observational study tracking whether drivers use a hands-free device (yes) or do not use a hands-free device (no) while waiting at a red light.
A study measuring the resting heart rate (in beats per minute) of participants before and after a public speaking task.