On measurement scales, using an even number of items (numbers or blanks) between the alternatives at the ends of the scale
a. makes a choice exactly in the center more likely to occur.
b. can confuse participants and invalidate the measure.
c. forces participants away from the center position.
d. only occurs on ratio scales.
C
There is no center choice when an even number of response alternatives are provided. If there is no center, then participants will be forced to make a choice that is NOT in the center position. If the directions are clear and the scale (pole) ends are mutually exclusive and opposite, participants won't be confused by the way in which the responses are gathered. Presenting an even number of choices is not restricted to ratio scales.
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