Homework 3 (Chapters 4 and 5) STAT 1350, Autumn 2021 not 1. What is the main difference between an experiment and an obs

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Homework 3 Chapters 4 And 5 Stat 1350 Autumn 2021 Not 1 What Is The Main Difference Between An Experiment And An Obs 1 (29.22 KiB) Viewed 21 times

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Homework 3 (Chapters 4 and 5) STAT 1350, Autumn 2021 not 1. What is the main difference between an experiment and an observational study? A. An experiment only includes a small number of subjects, but an observational study always involves a large number of subjects. B. An experiment imposes treatments on the subjects, but an observational study does C. An observational study imposes treatments on the subjects, but an experiment does not. D. Experiments can have variables, but observational studies cannot have variables. E. There is no difference, the term "experiment" is just another name for observational study." 2. I drinking alcohol good for your health? In a large study involving the survey of over 6,000 adults, it was observed that those adults classified as moderate drinkers (t.e., who drank one alcoholic beverage per day) were less likely to develop heart disease than those adults classified as nondrinkers. A critic of the study pointed out that we should not conclude that drinking alcohol causes better health because those who drink alcohol might carn more money and therefore be able to afford better medical services than those who do not drink alcohol. We would call the variable "affordance of better medical services" a[n) A response variable B. dependent variable C. lurking variable. D. explanatory variable. E treatment variable.