Suppose you develop a new self-report measure of the broad personality trait of extraversion. Distinguish between reliability and validity. Describe how you would establish the reliability and validity of your new test.
What will be an ideal response?
The student's answer should outline the following points:
Reliability vs. validity-Reliability refers to a test's measurement consistency. Validity refers to the degree that a test actually measures what it intends to measure.
One way to establish reliability might be to ask an individual to take the test twice, each attempt a week or month apart from the other. If the test is reliable, the individual's two scores should be very nearly identical.
One could establish a new test's validity by showing that scores on the test correlate at least moderately with scores on measures of personality traits related to extraversion, such as sociability, impulsivity, sensation seeking, and so on. The validity of a new test might also be established by showing that scores on the new test correlate well with scores on more well-established tests of extraversion.
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This will tell us the distance from the mean in SD units.
What will be an ideal response?
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