Explain which is the independent variable and which is the dependent variable 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.

Number of notebooks to buy

Price of a notebook

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.

Number of credit hours

Work$-$study hours assigned

c$.$ You anticipate earning a higher grade on your next economics exam because you studied more hours in the weeks preceding the exam.

Hours studying

Your anticipated grade