Introduction to Econometrics 3rd Edition by James Stock, Mark Watson

Exercise 21

Examples of random variables used in this chapter included (a) the gender of the next person you meet, (b) the number of times a computer crashes, (c) the time it takes to commute to school, (d) whether the computer you are assigned in the library is new or old, and (e) whether it is raining or not. Explain why each can be thought of as random.