Which of the following research approaches would be best for testing the hypothesis that the presence of certain odors causes people to gamble more? a) Experimental b) Observational c) Correlational d) Survey e) Case study.

Answer: Experimental

Explanation:

An experimental research would be needed to prove if the hypothesis that "the presence of certain odors causes people to gamble more" is correct or not.

An experiment is a process carried out in a scientific method to prove if a hypothesis is correct or not.