Grant helped Morgan by taking out the trash at her apartment on pick-up day. She thanked him for his assistance, increasing the likelihood that he would do it again. In this case Morgan's thank-you is an example of a:

The type of animal used in Pavlov's famous classical conditioning experiments was:

a) A rhesus monkey b) A white rat c) A cat d) A dog

A researcher who is investigating whether two variables are associated may measure the variables as they occur, without manipulating them. Such an approach would be

a. qualitative. b. experimental. c. longitudinal. d. correlational.