A professor wants to conduct a study to investigate which kind of note-taking technique (hand-written or computer-based) is better for memory and recollection. He decides to split his class into two groups - hand-written notes and computer-based notes - and measure better memory and recollection via the next exam scores. The two note-taking groups are what variable in the study?
a. Extraneous variable
b. Dependent variable
c. Independent variable
