Chapter 3 - Chapter 3 I. Our goal in choosing a sample is a...

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Chapter 3 I. Our goal in choosing a sample is a picture of the population, disturbed as little as possible by the act of gathering information II. Sample surveys are one kind of observational study III. In doing an experiment, we don’t just observe individuals or ask them questions IV. An observational study observes individuals and measures variables of interest but does not attempt to influence the response V. An experiment deliberately imposes some treatment among individuals to observe their responses VI. Two variables are confounded when their effects on a response variable cannot be distinguished from each other VII. Designing Samples A. The population in a statistical study is the entire group of individuals about which we want information B. A sample is the part of the population from which we actually collect information used to draw conclusions about the whole C. The design o a sample refers to the method used to choose the sample from the population D. Poor sample designs can produce misleading conclusions E. A voluntary response sample consists of people who choose themselves by responding to a general appeal 1. Voluntary response samples are biased because people with strong opinions, especially
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Chapter 3 - Chapter 3 I. Our goal in choosing a sample is a...

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