Diaz conducts a decision-making experiment to determine if people reason more logically when they have more time to decide.All the participants who are under 40 are allowed 15 minutes to reach a decision about a problem; all the participants who are over 40 are allowed 20 minutes to reach a decision about the same problem.What is the problem with this experimental design

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The problem with this experimental design is that the age of the participants is confounded with the independent variable (time allowed for decision-making). This means that any differences observed in the participants' reasoning abilities may be due to age rather than the time allowed for decision-making. To avoid this confound, a better approach would be to randomly assign participants to either a 15-minute or 20-minute time limit group regardless of their age.

Diaz Conducts a Decision-Making Experiment to Determine If People Reason