Question 1118331: There are several advantages of using a paired t-test. Since the same subjects are being tested in each of the varying conditions, those subjects serve as their own control. This is a major advantage as you need not consider potential differences between the subjects in the control group and the subjects who are in the experimental group. Elaborate on this concept by providing examples in which you do and do not have the same subjects serving as their own control.
There are also potential problems associated with interpreting the results of a paired t-test. Imagine you are interested in determining whether an employee of a company performs better with or without a bonus. What are some issues that could affect the results if you have the same subjects tested in both situations?
Justify your answers with appropriate reasoning
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! With or without a bonus has at least two types of bias. One is those who get the bonus may have more incentive to do more, and those who do not will not have that incentive and may even perform less. If the bonus is randomized, the possibility for abuse in both directions exists. Also, bonuses are usually given for good performance which biases such a study a priori.
Same subjects as their own control. Compare sunscreen by putting it on one arm of a subject but not the other. Or compare shoe wear by having a person wear a pair with one shoe treated differently from the other.
As for an example the one below with the bonus where one would not want to use a subject as his or her own control. Nor can we do it with some interventions like vaccination, where the time period is important and we need to offer or not offer the treatment to two different groups at the same time.
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