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AP Statistics Study Cards Flashcards

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6556156158ParameterA calculation made from population data0
6556156159StatisticA calculation made from sample data1
6556156160Convenience SampleUses subjects that are readily available (no randomization)2
6556156161Voluntary Response SampleSubjects choose to be part of the sample (no randomization)3
6556156162Simple Random SampleEvery member of the population is equally likely to be chosen.4
6556156163Steps to taking an SRS1. Assign each individual a number 2. Use table/calculator to choose sample (ignore repeats) 3. Indicate when to stop using the RNG 4. Identify subjects that correspond w/ selected #'s5
6556156164Stratified Random SamplePopulation is divided into groups and an SRS is selected from each group. Groups are different from one another. (some of all)6
6556156165Cluster SamplePopulation is divided into groups and an SRS of entire groups is selected. Groups are similar to one another. (all of some)7
6556156166Systematic Random SampleEvery kth member of the population is chosen8
6556156167Under-coverage BiasA group within the population is left out of the sampling frame9
6556156168Non-Response BiasPerson(s) chosen for the survey do not respond10
6556156169Response BiasSelected individuals respond incorrectly or untruthfully11
6556156170Statistics (the subject)The science (and art) of learning from data12
6556156171IndividualsThe objects described by a set of data. Individuals may be people, but they may also be animals or things.13
6556156172VariableAny characteristic of an individual14
6556156173Quantitative VariablesVariables that count or measure (numeric)15
6556156174Categorical VariablesVariables based on labels or categories (qualitative)16
6556156175Distribution of a variableGives the values of a variable and their frequency.17
6556156176Observational StudyWatching/observing individuals and recording variables of interest.18
6556156177ExperimentIndividuals are randomly assigned to groups where some treatment is imposed to determine cause and effect.19
6556156178PopulationThe entire group of individuals we are interested in20
6556156179SampleA subset of the population21
6556156180SamplingSurveying, experimenting on, or observing a portion of the population.22
6556156181CensusSurveying, experimenting on, or observing the entire population23
6556156182Sampling ErrorAny differences between what the sample says and what is actually true about the population. Cannot be entirely eliminated.24
6556156183Table of Random DigitsA long string of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 925
6556156184BiasWhen the design of the sample systematically favors certain outcomes.26
6556156185Wording of questionsCauses response bias by making the questions leading or confusing. Most important influence on the answers given to a survey.27
6556156186StrataGroups of individuals in a population which are similar with respect to the variable of interest.28

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