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Alle Oberthemen / Mathematics / Statistics

Statistics Test #1 (25 Karten)

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Statistics
a group of methods used to collect, analyze, present and interpret data and to make decisions
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Description statistics
consists of methods for organizing, displaying, and describing data by using tables, graphs, and summary measures
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Inferential Statistics
consists of methods that use sample results to help make decisions or predictions about a population
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population
total set of units, items, objects,or subjects of interest
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Parameter
numerical measure computed from population data
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sample
a subset of the population
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statistic
numerical measure computed from sample data
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representative sample
a sample that represents the characteristics of the population as closely as possible
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element or member
of a sample or population is a specific subject or object(person, firm, item, state, or country) about which the information is collected
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variable
any characteristics under study whose value change from one individual or object to another
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observation or measurement
the value of a variable for an element
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data set
a collection of observations on one or more variables
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discrete variable
possible values of the variable correspond to isolated points on the number line meaning this can assume only certain values with no intermediate values
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continuous variable
possible values of the variable form an entire interval on the number line
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cross-section data
data collected on different elements at the same point in time or for the same period of time
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time-series data
data collected on the same element of the same variable at different points in time or for different periods of time
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random sample
drawn in such a way that each member of the population has a chance of being selected in the sample
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nonrandom sample
when some members of the population may not have any chance of being selected in a sample
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selection bias
occurs when the way the sample is selected systematically excludes some part of the population of interest
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measurement or response data
occurs when the method of observation tends to produce values that systematically differ from the true value in some way
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Nonresponse bias
occurs when responses are not actually obtained from all individuals selected for inclusion in the sample
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observational study
when the investigator observes characteristics of a subset of the members of one or more existing populations
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confounding variable
one that is related to both group membership and the response variable of interest
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experiment
when an investigator observes how a response variable behaves when the researcher manipulates one or more factors.
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placebo
something that is identical in appearance, taste, feel, etc. to the treatment received by the treatment group, except that it contains no active ingredients)
Kartensatzinfo:
Autor: MACsgirl11608
Oberthema: Mathematics
Thema: Statistics
Schule / Uni: University of South Alabama
Ort: Mobile
Veröffentlicht: 01.03.2010
 
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