4 How many variables are in this data set? a. 40 b. 4 C. 5 d. 3 Questions 3, 4, and 5 are based on the following information: In many universities, students evaluate their professors by means of answering a questionnaire. Assume a questionnaire is distributed to a class of 40 students. Students are asked to answer the following: 1. Sex, 2. Age, 4. Number of hours completed, 5. Grade point average, 6. My instructor is a very effective teacher 1 2 3 5 strongly agree moderately agree neutral moderately disagree strongly disagree