Determine if the following scenario is an observational study or a controlled experiment. A doctor is interested in determining whether a certain medication increases the risk of high blood pressure. He reviews his patients' medical records and finds that a higher proportion of people who take the medication are suffering from high blood pressure. A) Neither B) Observational study C) Controlled experiment
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The essential difference between an experiment and an observational study is that a. observational studies always involve large numbers of subjects, but experiments never do. b. In an experiment, information is gathered only on animals or things, but in an observational study, only information about people is gathered. c. An experiment imposes treatment on the subjects, but an observational study does not. d. An observational study imposes treatments on the subjects, but an observational study does not.
Sri K.
Determine whether the study depicts an observational study or an experiment. Twenty patients with leukemia are divided into two groups. One group is treated with an experimental drug, while the other is not. After one month, both groups are questioned about their energy level. Is the study an observational study or an experiment? A) The study is an experiment because the researchers control one variable to determine the effect on the response variable. B) The study is an observational study because the study examines individuals in a sample but does not try to influence the response variable. C) The study is an observational study because the researchers control one variable to determine the effect on the response variable. D) The study is an experiment because the study examines individuals in a sample but does not try to influence the variable of interest.
Determine whether the following study is an observational study or an experiment. If the study is an experiment, identify the control and treatment groups, and discuss whether single- or double-blinding is necessary. If the study is observational, state whether it is a case-control study, and if so, identify the cases and controls. In a study of the effects of magnets on back pain, some participants were treated with magnets while others were given nonmagnetic objects with a similar appearance. The magnets did not appear to be effective in treating back pain. Choose the correct answer below. A. Experiment; the treatment group is all patients and the control group is patients that received the magnets; single-blind B. Observational study; not case-control C. Experiment; the treatment group is patients that used the magnets and the control group is patients that received the placebo; double-blind D. Observational study; case-control; the cases are the patients that received magnets, the controls are the patients that received placebos
Kari H.
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