IntroStat-ch. 1-1, 1-2 notes

# IntroStat-ch. 1-1, 1-2 notes - Introduction to Statistics...

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09-05-07 Introduction to Statistics Notes Ch. 1- 1, 1-2 -with two degrees of separation, the target person is not counted -concept of 6 degrees of separation: 1967 study by psychologist Stanley Milgram found that two random residents in the United States are connected by an average of six intermediaries -the method used to collect sample data can make or break the validity of conclusions based on the data -you can learn about a large group be examining data from some of its members -cannot complete census studies because it is impossible to reach the entire population of the country -it’s extremely critical to obtain sample data that are representative of the population from which the data are drawn -sample data must be collected in an appropriate way, such as through random selection or else they will be useless -the word statistics is derived from the Latin word status meaning “state” -early uses of statistics involved complications of data and graphs describing various aspects of a state or country

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