3. A recent study showed that vitamin D supplementation in multiple sclerosis pa

Question

3. A recent study showed that vitamin D supplementation in multiple sclerosis patients have a decreased relapse incidence rate. The researchers measured the relapse incidence rate for six months before vitamin D supplementation and six months after the vitamin D supplementation on several occasions. The participants in this study were all volunteers who were associated with the medical clinic.

1) Which of the following research strategies would this study fall under? Non-experimental Quasi-experimental Experimental

2) What kind of research design was this study? Posttest-only non-equivalent control group study Pretest-posttest non-equivalent control group design Time series design Longitudinal design

3)What is the pre-existing independent variable that is being studied?

Explanation / Answer

1)   Which of the following research strategies would this study fall under?

Non-experimental Quasi-experimental Experimental

This is a quasi-experimental study because it makes use of a variable that is already inherently present in the sample (i.e. patients with MS).

2)   What kind of research design was this study?

Posttest-only non-equivalent control group study Pretest-posttest non-equivalent control group design Time series design Longitudinal design

This is a pre-test-post-test design because relapse rates are measured before and after the intervention (which can be thought of as the “test”). Also it has a non-equivalent control group because only patients with MS are being studied.

3)   What is the pre-existing independent variable that is being studied?

The pre-existing IV in this case is Multiple Sclerosis. This is pre-existing as a characteristic of the participants.

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