Question

1. a school tests two different lunch lines to see which one moves faster. line a is used during first lunch; line b is used during second lunch. which problem does this design suffer from?

○ lack of control
○ confounding due to time of day
○ poor measurement of the response variable
○ too many treatments

Explanation:

The school tests Line A in first lunch and Line B in second lunch. Time of day (first vs. second lunch) is a confounding variable—differences in line speed could stem from time (e.g., first lunch being busier) rather than the line design itself.

Answer:

Confounding due to time of day