Professor Morgan questions whether the ratings he receives from his students on "teaching effectiveness" indicate how much the students learn in his class or whether they are just a reflection of how much his students like him. What aspect of the ratings is he questioning?
a. the use of an interval scale
b. the statistical significance of the ratings
c. the measurement validity of the ratings
d. the reliability of the ratings

C. the measurement validity of the ratings

Explanation:

The MEASUREMENT VALIDITY of a tool refers to the degree to which the tool measures that which it purports to measure.

In wondering if it was really "teaching effectiveness" that was being measured by the rating as opposed to his likeability, Professor Morgan was questioning whether the ratings purporting to measure teaching effectiveness were really doing so.

this statement is true.

forests are public goods, available for everybody. when usage of such a good becomes interesting for consumers and its usage increases, there can be a risk of overexploitation. it is a non rival good therefore, if one person consumes the good it does not reduce the availability for subsequent consumers.

these caracteristics require the establishment of measures in order to prevent the destruction of a commonly owned space, for example, to restrict the amount of people that have access to the same time.