True or False? In Exercises 5-10, determine whether the statement is true or fal

Question

True or False? In Exercises 5-10, determine whether the statement is true or false. If it is false, rewrite it as a true statement. 5. A placebo is an actual treatment. 6. A double-blind experiment is used to increase the placebo effect. 7. Using a systematic sample guarantees that members of each group within a population will be sampled. 8. A census is a count of part of a population. 9. The method for selecting a stratified sample is to order a population in some way and then select members of the population at regular intervals. 10. To select a cluster sample, divide a population into groups and then select all of the members in at least one (but not all) of the groups. Observational Study or Experiment? In Exercises 11-14, determine whether the study is an observational study or an experiment. Explain 11. In a survey of 177,237 U.S. adults, 65% said they visited a dentist in the last 12 months. (Source: Gallup) 12. Researchers demonstrated in people at risk for increased cardiovascular disease that 2000 milligrams per day of acetyl-L-carnitine over a 24-week period lowered blood pressure and improved insulin resistance. (Source American Heart Association) 13. To study the effecet of music on driving habits, cight drivers (Gour male and four female) drove 500 miles while listening to different genres of music. (Source: Confused.com) 14. To study predator-prey relationships in the Bering Sea, researchers looked at the feeding behaviors of three species: black-legged kittiwakes, thick-billed murres, and northern fur seals. (Source: PLOS ONE)

Explanation / Answer

5) False. Placebo is a fake treatment

6) False. Double blinding is used to decrease the placebo effect.

7) False. Using a stratified sample guarantees that members of each group within a population will be sampled.

8) False. A census is a count of an entire population

9) False. The method of selecting a systematic sample is to order a population in some way and then select members of the population at regular intervals.

10) True.

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