6.A statistics instructor wants to measure the effectiveness of his teachingskills in a class of 81 students (N = 81). He selects students by waiting at the door to the

classroom prior to his lecture and pulling aside every third student to give him or her a questionnaire. (a) Assuming that all students attend his class that day, how many students will he select to complete the questionnaire? Students.... (b) Is this sample design an example of random sampling? Explain. Yes, because each student has an equal chance of being selected, and each student is replaced before selecting another student. No, because each student is not selected at random, and each student is not replaced before selecting another student.