In an experiment on the effects of stimulant drugs on math test performance, a r

Question

In an experiment on the effects of stimulant drugs on math test performance, a researcher splits her participants into two groups, then measures their baseline math test performance by giving both groups the same test. She then gives the first group a stimulant and the other group a placebo pill. Finally, she again tests the math test performance of both groups and makes a comparison. What kind of research design is this?

a.Posttest only

b.Pretest-posttest

c.Concurrent measures

d.Repeated measures

In an experiment on the effects of emotional images on memory performance, a researcher presents a set of images containing both pleasant positive images and disturbing images (dead bodies and wounded limbs) in random order, and then tests their recognition memory for those images to see which type they remember better. What kind of research design is this? a.Posttest only

b.Pretest-posttest

c.Concurrent measures

d.Repeated measures

Explanation / Answer

1. Correct Answer - Pretest - Posttest

Here, the participants are measured on the baseline math performance before the administration of the stimulant or the placebo, and after the presentation of the independent variable the performance is measure. This design is called the pretest - post design.

2. Correct Answer - Concurrent Measures

In concurrent measures design both the levels of the independent variables are presented at the same time or presented in a quick succession. Here the positive and the disturbing images are presented one after another to see the recognition. This is called the concurrent measures design.

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