If Researchers Are Interested in the Average Time It Takes

Multiple Choice

If researchers are interested in the average time it takes to press a button when a green light flashes on a screen,and they simply measure the reaction times of volunteers who sign up for the study,what rationale would the researchers give for not using random sampling?

A) Sometimes generality does not matter.
B) Sometimes generality cannot be determined.
C) Sometimes generality can be determined.
D) Sometimes generality can be assumed.