1. Sometimes newspapers sample opinions of the local population by printing a "ballot" and asking readers to mark it and mail it in. Evaluate this sampling technique.

2. Consider as a population the students at State U. whose names are listed alphabetically in the student directory. Are the following samples biased or random?
a. Every fifth name on the list

b. Every member of the junior class

c. 150 names drawn from a box that contains all the names in the directory

d. One name chosen at random from the directory

e. A random sample from those taking the required English course.