W RO Section 1.3 In Exercises 19 and 20, determine whether the study is an observational study or an experiment. Explain

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W Ro Section 1 3 In Exercises 19 And 20 Determine Whether The Study Is An Observational Study Or An Experiment Explain 1 (55.74 KiB) Viewed 144 times

W RO Section 1.3 In Exercises 19 and 20, determine whether the study is an observational study or an experiment. Explain. 19. Rescarchers conduct a study to determine whether a drug used to treat hypertension in patients with obstructive sleep apnen works better when taken in the morning or in the evening. To perform the study, 78 patients are given one pill to take in the morning and one pill to take in the evening (one containing the drug and the other a placebo). After 6 weeks, researchers collected blood pressure information on the patients. (Souro American Thoracic Society) 20. Researchers conduct a study to determine the effect of coffee consumption on the development of multiple sclerosis. To perform the study, researchers asked 4408 adults in Sweden and 2331 adults in the United States how many cups of coffee they drink per day. (Source: American Association for the Advancement of Science) In Exercises 21 and 22, two hundred students volunteer for an experiment to test the effects of sleep deprivation on memory recall. The students will be placed in one of five different treatment groups, including the control group. 21. Explain how you could design an experiment so that it uses a randomized block design 22. Explain how you could design an experiment so that it uses a completely randomized design In Exercises 23-28, identify the sampling technique used, and discuss potential somes of bias (if any). Explain. 23. Using random digit dialing, researchers ask 1201 U.S. adults whether enough is being done to fight opioid addiction. (Source: Kaiser Family Foundation)