Martina believes that high doses of caffeine slow a person's reaction time. to test this belief, he has five friends each drink three 8-ounce cups of coffee and then measures their reaction time on a learning task. what is wrong with martina's research strategy?

The answer is "there is no control group".

Control group, the standard to which examinations are made in an analysis. Numerous examinations are intended to incorporate a control gathering and at least one test gatherings; actually, a few researchers save the term try for think about outlines that incorporate a control gathering.  

Ideally, the control group and the experimental groups are indistinguishable inside and out with the exception of that the trial bunches are subjected to medications or interventions accepted to affect the result of intrigue while the control group isn't.

answer; supertaster;