AP Statistics Unit 2 Practice Problems
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Your advanced placement statistics studies have been going well so far, but it’s time to see how much attention you’ve really been paying as we put your knowledge to the test in this AP Statistics Unit 2 Practice Problems quiz, with reference to Experimental Design. What do you know?
- 1.Data were collected in 20 cities on the percentage of women in the workforce. Data were collected in 1990 and again in 1994. Gains, or losses, in this percentage were the measurement upon which the studies conclusions were to be based. What kind of design was this? I. A matched pairs designII. An observational studyIII. An experiment using a block design
- A.
A. I only
- B.
B. II only
- C.
C. III only
- D.
D. I and III only
- E.
E. I and II only
- 2.A recent study showed that tea drinkers have lower stress levels than coffee drinkers. Tea drinkers are known to have a higher proportion of yoga practitioners than coffee drinkers, and they exercise on average two hours per week more than their coffee-drinking counterparts. What is the term used to describe these additional factors that might have an effect on the stress levels of tea drinkers?
- A.
A. Categorical variables
- B.
B. Cause-and-effect variables
- C.
C. Confounding variables
- D.
D. Unfounded variables
- E.
E. Quantitative variables
- 3.A group of 420 college students are enrolled in a blind test. The schools food service wants to see if they can improve the taste of their lattes. They decide to try two types of coffee beans (Aracabia and Robusta); three types of syrup (vanilla, hazelnut, and mocha); and two types of milk (soy and low fat). The best combination of ingredients is sought. The latte experiment will have
- A.
A. 2 factors, 7 levels and 420 treatments
- B.
B. 2 factors, 3 levels and 12 treatments
- C.
C. 3 factors, 7 levels and 420 treatments
- D.
D. 3 factors, 12 levels and 420 treatments
- E.
E. 3 factors, 7 levels and 12 treatments
- 4.You want to do a survey of members of the senior class at your school and want to select a simple random sample. You intend to include 40 students in your sample. Which is the following approaches will generate a simple random sample?
- A.
A. Write the name of each student in the senior class on a slip of paper and put the papers in a container. Then randomly select 40 slips of paper from the container.
- B.
B. Assuming the classes are unlaned, select two classes at random and include those in your sample.
- C.
C. From a list of all seniors, select every nth name on the list until you have 40 people selected.
- D.
D. Select the first 40 seniors to pass through the cafeteria door at lunch.
- E.
E. Randomly select 10 students from each of the four senior calculus classes.
- 5.Your company has developed a new treatment for acne. You think men and women might react differently to the medication, so you separate them into two groups. Then the men are randomly assigned to two groups and the women are randomly assigned to two groups. One of the two groups is given the medication and the other is given a placebo. The basic design of this study is
- A.
A. Completely randomized
- B.
B. Comparative randomized, blocked by gender
- C.
C. Completely randomized, stratified by gender
- D.
D. Randomized, blocked by gender and type of medication
- E.
E. A matched pairs design
- 6.A student organization wants to assess the attitudes of students towards a proposed change in the hours the library is open. They randomly select 50 freshmen, 50 sophomores, 50 juniors, and 50 seniors to survey. This situation is described as
- A.
A. A stratified random sample
- B.
B. A simple random sample
- C.
C. A convenience sample
- D.
D. A systematic random sample
- E.
E. An observational study
- 7.A television station broadcast a court trial in its entirety. During a news program, viewers were asked to go to the TV station’s website and state whether they thought the defendant was guilty or not guilty. Of the 1,840 viewers who gave their opinion, 1,521 felt that the defendant was not guilty. The viewers who registered their opinions constitute
- A.
A. A convenience sample
- B.
B. A voluntary response sample
- C.
C. A probability sample
- D.
D. A stratified random sample
- 8.Melanie bakes two identical batches of cookies from a recipe, except one batch is made with sugar and the other batch is made with a sugar substitute. She puts the two batches of cookies into identical jars labeled “A” and “B.” She invites her friends to sample each type of cookie and to choose which cookie tastes best. What type of experimental design has she used?
- A.
A: Double dummy design
- B.
B: Single-blind design
- C.
C: Double-blind design
- D.
D: Finite population design
- E.
E: Stratified sample design
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