STATS 250 Lecture Notes - Lecture 2: Opendocument, Random Number Table, Exploratory Data Analysis
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STATS 250 Full Course Notes
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Descriptive statistics: describing data using numerical summaries (such as the mean, iqr, etc. Population: the entire group of items/individuals that we want information about, about which inferences are to be made. Sample: the smaller group, the part of the population we actually examine in order to gather information. Variable: the characteristic of the items or individuals that we want to learn about. Parents probably do not represent all adults in this case as the question is about a law that would directly affect their children: available data: pulse rates for smokers and nonsmokers in a large stats class at a major university. From utts, jessica m. and robert f. heckard. Sample surveys are often used to estimate the proportion or percentage of all people who have a certain trait or opinion ( p ). Newspapers and magazines routinely survey only one or two thousand people to determine public opinion on current topics of interest.
