When either type of study is feasible, an experiment is usually preferred over an observational study. Explain why, using an example to illustrate. Also explain why it is not always possible for researchers to carry out a study in an experimental framework. Give an example of such a situation.
Answer to relevant QuestionsConsider the same setting as that of Exercise 4.39. Of the 100 participants, 45 are male and 55 are female. During the design of the study, one member of the research team suggests that all males be given the active drug and ...Of 400 employees at a company, 25% work in production, 40% work in sales and marketing, and 35% work in new product development. As part of a security awareness training program, the group overseeing implementation of the ...A study (Psychosomatic Medicine 2002; 64: 593–603) claimed that people who consume caffeine regularly may experience higher stress and higher blood pressure. In the experiment, 47 regular coffee drinkers consumed 500 ...The Gallup U.S. Employment poll reported on March 15, 2011, a national unemployment rate of 10.4%. (Data from www.gallup.com/poll/125639/Gallup_Daily_Workforce.aspx.) a. Gallup claims that the margin of error of the poll is ...“Playing video games not so mindless.” This was the headline of a CNN news report 16 about a study that concluded that young adults who regularly play video games demonstrated better visual skills than young adults who ...
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