In crum and langer's hotel experiment, the group of participants who were informed that housekeeping work was good exercise was the a. placebo control group. b. experimental group. c. extraneous group. d. control group or control condition.

The answer is b. experimental group

Explanation:

Crum and Langer Experiment:

Conducted in 2007, Crum and Langer's Hotel experiment was designed to test the hypothesis that changing people's perceptions and beliefs about a particular exercise or physical activity would incur actual health benefits.Crum and Langer picked the participants from the staff of seven similar hotels. The participants who were informed about the health benefits of cleaning and housekeeping work were the experimental group. An experimental group is a sample or participant group that receives a particular treatment. The experimental group helps to determine the effects of a treatment (in this case, information regarding health benefits of cleaning).The control group is a group of participants that does not receive the treatment. The uninformed group that did not receive the information about the health benefits of housekeeping work.As a result, the experimental group showed health improvements whereas the uninformed group showed no significant changes in health status.