You want to determine the opinions of students regarding stem cell research. Identify the sampling technique you are using when you select the samples listed.
1. You select a class at random and question each student in the class.
2. You assign each student a number and, after choosing a starting number, question every 25th student.
a. Determine how the sample is selected and identify the corresponding sampling technique.
b. Discuss potential sources of bias (if any). Explain.