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All of these are potential sources of differences between the scores.
All of these are potential sources of differences between the scores. See 12–4:
Establishing the Validity and Reliability of Measures.
12.05 – Explain the concept of validity as it relates to survey items.
62. An advertiser has developed a television advertisement designed to create a “feeling of warmth” on the part of
viewers because she believes that this will lead to positive attitudes toward the product and ultimately to increased
sales. In order to determine if the ad does produce the desired feelings in viewers, she has devised a three-item scale to
measure the warmth construct. After viewing the commercial (independently), Joe had a score of 15 on the warmth
scale, and Perry had a score of 9. Which of the following statements is FALSE?
The scale used is likely to be at least as reliable as a ten-item scale because a ten-item scale is more likely to
inadvertently tap into constructs other than warmth.
If Joe and Perry had viewed the commercial and listened to instruction together at the same time and then
had completed the scales, at least one source of variation might have been greatly reduced.
It is possible that Perry’s lower score might have resulted from accidentally checking the wrong response.
Some relatively stable characteristic of an individual, such as Perry’s unwillingness to share the actual
intensity of his feelings, might have contributed to the difference in the two scores.
Joe did not necessarily have “warmer” feelings toward the ad than Perry.
All of the statements are true except that the scale used is likely to be at least as reliable
as a ten-item scale because a ten-item scale is more likely to inadvertently tap into
constructs other than warmth. See 12–4: Establishing the Validity and Reliability of
Measures.
12.05 – Explain the concept of validity as it relates to survey items.
63. In a recent survey, those who brushed their teeth often under-reported the activity, while those who brushed their
teeth less frequently over-reported their dental hygiene behavior. The possible cause for differences in scores could best
be attributed to
a true difference in the characteristic being measured.
differences due to situational factors.
differences due to temporary personal factors.