Question

experimental vs. observational
a researcher believes that the origin of the beans used to make a cup of coffee affects hyperactivity. he wants to compare coffee from three different regions: africa, south america, and mexico. which is the response variable?
number of cups of coffee
orgins of beans
hyperactivity level
the researcher

Explanation:

In an experiment, the response variable is what is being measured or observed. Here, the researcher is interested in how the origin of coffee beans (the explanatory variable) affects hyperactivity. So, hyperactivity level is what is being measured (the response). The number of cups of coffee isn't mentioned as a factor in the problem description. The origin of beans is the explanatory variable. The researcher is not a variable in the context of the experiment's variables.

Answer:

hyperactivity level