Which group(s) are affected by the placebo effect? The control group The treatment group

1. A company sponsoring a new Internet search engine wants to collect data on the ease of use of the new search engine. Which is the best way to collect the data? • Census • Sample survey • Observational study • Experiment

2. A company sponsoring a new Internet search engine wants to collect data on the ease of use of the new search engine. Which is the best way to collect the data? • Census • Sample survey • Observational study • Experiment

3. We wish to compare the average ages of the math and science teachers at your high school. Which is the best way to collect the data? • Census • Sample survey • Observational study • Experiment

4. We wish to compare the average ages of the math and science teachers at your high school. Which is the best way to collect the data? • Census • Sample survey • Observational study • Experiment

5. More dogs are being diagnosed with thyroid problems than have been diagnosed in the past. A researcher identified 50 puppies not already diagnosed with a thyroid problem and followed the dogs for several years to see if any developed thyroid problems. This is a(n) • Randomized experiment • Survey • Prospective study • Retrospective study

6. More dogs are being diagnosed with thyroid problems than have been diagnosed in the past. A researcher identified 50 puppies not already diagnosed with a thyroid problem and followed the dogs for several years to see if any developed thyroid problems. This is a(n) • Randomized experiment • Survey • Prospective study • Retrospective study

7. Which group(s) are affected by the placebo effect? • The control group • The treatment group • Both the control and the treatment groups • Neither the control nor the treatment group

8. Which group(s) are affected by the placebo effect? • The control group • The treatment group • Both the control and the treatment groups • Neither the control nor the treatment group

9. Double-blinding in experiments is important so that • I. The evaluators do not know which treatment group the participants are in. • II. The participants do not know which treatment group they are in. • III. No one sees which treatment any of the participants are getting. • I only • II only • III only • I and II • I, II, and III

10. Double-blinding in experiments is important so that • I. The evaluators do not know which treatment group the participants are in. • II. The participants do not know which treatment group they are in. • III. No one sees which treatment any of the participants are getting. • I only • II only • III only • I and II • I, II, and III

11. Which of the following is not required in an experimental design? • Blocking • Control • Randomization • Replication

12. Which of the following is not required in an experimental design? • Blocking • Control • Randomization • Replication

13. In an experiment the primary purpose of blinding is to reduce . . . • bias. • confounding. • randomness. • variation.

14. In an experiment the primary purpose of blinding is to reduce . . . • bias. • confounding. • randomness. • variation.

15. In an experiment the primary purpose of blocking is to reduce . . . • bias. • confounding. • randomness. • variation.

16. In an experiment the primary purpose of blocking is to reduce . . . • bias. • confounding. • randomness. • variation.

17. Does donating blood lower cholesterol levels? 50 volunteers have a cholesterol test, then donate blood, and then have another cholesterol test. Which aspect of experimental design is present? • Randomization • A control group • A placebo • Blinding • None of these

18. Does donating blood lower cholesterol levels? 50 volunteers have a cholesterol test, then donate blood, and then have another cholesterol test. Which aspect of experimental design is present? • Randomization • A control group • A placebo • Blinding • None of these