4. A researcher is writing a research protocol to study the effects of a new dru

Question

4. A researcher is writing a research protocol to study the effects of a new drug, Drug N, on food intake in rats. The researcher wants to determine the optimal dose and established three independent groups, which received either 0 mg/ml; 5 mg/ml; or 10 mg/ml of Drug N. Food consumed is determined 3 hours after the rats were given an intraperitoneal injection of Drug N.

1) What is the minimum total number of rats the researcher should start with?

2) What research design was used in this study? Between-group Within-group

3) The researcher suggests that Drug N can be used as an appetite stimulant in patients who are terminally ill or have eating disorders. Which of the following limits the conclusions the researcher makes about Drug N? Cross-species generalization Timing of measurement Pre-existing differences in humans

Explanation / Answer

1) What is the minimum total number of rats the researcher should start with?

3 rats. This is because all three levels if IV manipulation (0 mg/ml; 5 mg/ml; or 10 mg/ml of Drug N) needs to be tested out.

2) What research design was used in this study?

Between-group Within-group

This is a between-group design because the three levels of independent variable manipulation are being testing simultaneously among different rats.

3) The researcher suggests that Drug N can be used as an appetite stimulant in patients who are terminally ill or have eating disorders. Which of the following limits the conclusions the researcher makes about Drug N? Cross-species generalization Timing of measurement Pre-existing differences in humans

This is because the experiment has been conducted on rats but conclusions are drawn stating its applicability to human beings (who are from a different species altogether).

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