Twenty thousand undergraduate students are randomly selected at a large universi

Question

Twenty thousand undergraduate students are randomly selected at a large university to participate in a study of how a virtual reality-based physics curriculum affects achievement. The researcher conducting the study assigns half the sample, chosen at random, to receive the virtual reality curriculum. The other half is provided with the traditional textbook curriculum. Both groups are then given a physics test and the number of correct answers compared. The researcher finds the students who had used the virtual reality curriculum scored significantly better than the students who had used the textbook. This study design is flawed because it did not control for the possibility that the students who had been assigned to the virtual reality group may have started off with higher levels of achievement. True or False? Why?

Explanation / Answer

In Random Sampling everyone in the entire target population has an equal chance of being selected. The advantages are that your sample should represent the target population and eliminate sampling bias, but the disadvantage is that it is very difficult to achieve (i.e. time, effort and money).

Hence as we have used random sample here it will eliminate sampling bias and so answe is False.

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