# Statistics 250

Apr 30th, 2015
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University of Michigan - Ann Arbor
Course: General Education
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Statistics: numbers measured for some purpose; collection of procedures and principles for gathering data and analyzing data to help people make decisions when faced w/ uncertainty

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Section 1.1Statistics: numbers measured for some purpose; collection of procedures and principles for gathering data and analyzing data to help people make decisions when faced w/ uncertaintySection 1.2dotplot: plot in which each dot represents response of individualfive-number summary: lowest/highest values; cutoff points for , , and of datamedian: value in middle when numbers are put in orderlower quartile: median of lower halve of dataupper quartile: median of upper halve of datarisk: estimation that bad outcome will occur in future based on pastbase rate (baseline risk): rate or risk at beginning time period or under specific conditionspopulation: collection of all individuals about which information is desiredrandom sample: subset derived from population so that each individual has specified probability of being part of samplesample survey: investigative gathering of opinion or information from each sample individualmargin of error: number added to/subtracted from sample information to produce 95% certain intervalself-selected sample (volunteer sample) => ask anyone who wishes to respond to do soex. magazines, television stations, Internet websites, etc.observational study: study in which participants are observed and measuredvariable: characteristic that differs from one individual to nextconfounding variable: variable that is not main concern of study, but may be partially responsiblerandomized experiment: study in which treatments

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