Final answer:
Sherree's measure of altruism has good construct validity because it accurately represents the construct of altruism by relating well to actual altruistic behavior.
Step-by-step explanation:
When Sherree studies altruism and uses a measure of altruism that has been shown to relate to altruistic behavior consistent with expectations, Sherree's measure of altruism can be said to have good construct validity. Construct validity refers to the degree to which a given variable actually captures or measures what it is intended to measure. In this case, since the measure of altruism relates well to actual altruistic behavior, it effectively reflects the construct it was designed to assess.
It's important to note that while any valid measure is by necessity reliable, meaning that it would yield consistent results under the same conditions, the reverse is not necessarily true; a reliable measure might not always be valid. Validity ensures that the study or measuring tool is doing what it claims to be doing, which is crucial for scientific research and particularly for sociological studies like those that involve measuring complex constructs such as altruism.