Name: ______Section: ______
Quiz 2
Ch5 – Ch6
1: Write down your name and section number. (5pts)
Use the following to answer questions 2-7:
Students in a large statistics class were randomly divided into two groups. The first group took the midterm exam with a symphony by Mozart playing in the background while the second group took the exam with rock music playing. The scores of the two groups on the exam were compared.
2. In this experiment the response variable is ______(2pts)
A) the score on the midterm exam.
B) the type of music that was playing during the exam.
C) the placebo.
D) the final course grades of students.
3. In this experiment the explanatory variable is ______(2pts)
A) the score on the midterm exam.
B) the type of music that was playing during the exam.
C) the placebo.
D) the final course grades of students.
4. The study design for this experiment is called ______(2pts)
A) a simple random sample design.
B) a completely randomized design.
C) a matched pairs design.
D) a randomized blocks design
5. This experiment was not double-blind because ______(2pts)
A) students were allowed to keep their eyes open while taking the exam.
B) the exam was too long.
C) the students knew the type of music that was playing while they were taking
the exam.
D) some of the students did not study for the exam.
6. To improve the design of this experiment, one part of it should be done in a blind way. That is, we should ______(2pts)
A) make the students take the exam in a dark room.
B) not allow the students to find out their grades on the exam.
C) tell all of the students that they will receive a grade of A on the exam if they
Agree to participate.
D) be sure that the person grading the exam does not know which students
listened to Mozart and which listened to rock music.
7. The researcher suspects that females and males respond to the music in a different ways. So he decided to divide the class into female/male groups. And randomly assign the two types of music to the students within each group separately. This design is ______(2pts)
A)an observational study.
B) a completely randomized experiment.
C) a randomized block design.
D) a matched pairs design.
8. Men who have worked as coal miners for many years generally have lung problems. They call their problems “black lung disease.” Suppose, however, that almost all coal mines smoke. This is an example of ______(2pts)
A) confounding.
B) the placebo effect.
C) a double-blind experiment.
D) voluntary response sampling.
9. Turn in your 3 inch x 5 inch cheat sheet with your name on it. (1pt)