Slate is a daily magazine on the Web. Its business activities can be described by a number of variables. What is the level of measurement for each of the following variables?
a. The number of hits on their website on Saturday between 8:00 am and 9:00 am.
b. The departments, such as food and drink, politics, foreign policy, sports, etc.
c. The number of weekly hits on the Sam’s Club ad.
d. The number of years each employee has been employed with Slate.