A pharmaceutical company wishes to test the effects of a herbal supplement on an

Question

A pharmaceutical company wishes to test the effects of a herbal supplement on anxiety levels. The researcher randomly selects a sample of n=16 adults from Essex County. The sample is randomly assigned to either the herbal supplement, Group B or a placebo, Group A.

Here are the data:

GROUP “A”                                            GROUP “ B “

12, 16, 18, 21,                                        13, 18, 20, 16

17, l8, l8, 19                                            19, 21, 19, 22

1)What are the two mean “differences” you are analyzing in these data?

2. What is the definition of a random assignment?

3. If a researcher failed to use random assignment, how would this affect the research conclusion?

4. If a researcher failed to use a random sample, how would this affect the research results?

Explanation / Answer

2)Random assignment is an experimental technique for assigning human participants to different groups in an experiment (e.g., a treatment group versus a control group) using randomization.

3)Random assignment helps protect you from the perils of confounding variables and competing explanations. If a researcher failed to use random assignment, research conclusion will have effect of confounding

4)random selection is important because you need a representative sample in order to generalize from that specific sample to the population.

If the researcher failed to use a random sample, we cannot imply the results to the population.

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