Explain which the independent variable is and which the dependent variable is for each of the following examples.
a. Once you determine the price of a notebook at the college bookstore, you will decide how many notebooks to buy.
b. You will decide how many credit hours to register for this semester once the university tells you how many work-study hours you will be assigned.
c. You anticipate earning a higher grade on your next economics exam because you studied more hours in the weeks preceding the exam.