In a matched-pairs design, which of the following is INCORRECT about the use of
ID: 3267157 • Letter: I
Question
In a matched-pairs design, which of the following is INCORRECT about the use of a paired experiment?
(a) The object of pairing is to account for the possible effect of other factors.
(b) The analysis of paired data starts by finding the difference between the val- ues of the pair. The order of the difference is unimportant (as long as it is
consistent).
(c) It is crucial to recognize pairing. If pairing is not recognized, the results will
not be as accurate and precise as possible.
(d) The degrees of freedom is equal to the number of pairs - 1.
(e) Because pairing is beneficial, we can pair all data by matching the smallest value of each sample, the second smallest value of each sample, the third small- est value of each sample, etc.
Explanation / Answer
option E is incorrect
A matched pairs design is a special case of a randomized block design. It can be used when the experiment has only two treatment conditions; and subjects can be grouped into pairs, based on some blocking variable. Then, within each pair, subjects are randomly assigned to different treatments.
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