... be asked leading questions or closed answer questions, which could in turn effect the results drastically. A control group was also used. This was in the second part of the experimental research. There were 150 students, who were shown a video and later were all asked questions, all but 50 students who were not questioned at all. This was the control group. The control group was used as a comparison group. Their answer to the question 'Did you see any broken glass?' was to be compared with those from the experimental group, who were asked questions about the video a week earlier. The advantages to having students as participants is that there are always students around who are willing to proceed with these experiments, especially if there is money in hand. However this could demand the attention of ethics. Yet there is another disadvantage to having students as all the ...

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