For Each of the Situations Below, Identify the Independent Variable

Essay

For each of the situations below, identify the independent variable and the dependent variable.
a. A study to determine the effect of humidity on running speed.
b. Students memorize a list of difficult vocabulary words while listening to jazz, classical music, or country and western music. Their recall of the words was then measured.
c. Research participants are asked to solve a jigsaw puzzle in rooms where the temperature is either cold, comfortable, or hot. The amount of time it takes to solve the puzzle is recorded.