In each case determine if the variable stated is qualitative, quantitative and discrete, or quan­titative and continuous.

1. the presidential voting preferences of voters in U.S.
2. the number of books bought by the customers of bookstore
3. the weight of professional football players
4. the marital status of all adults in U.S.
5. the amount spent by customers of book­store
6. the date and time of birth of in this class
7. the strength in pounds per square inch of beams produced on assembly line
8. the age of U.S. citizens
9. area code for your home phone