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Definition
a set of individuals selected from a population, usually intended to represent the populations in a research study 


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Definition
a value that describes a sample 


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Definition
the set of all the individuals of interest in a particular study 


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Definition
the set of all the individuals of interest in a particular study 


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Definition
a value that describes a population; derives from measurements of the individuals in the population 


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Definition
mathematical procedures that simplify data 


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Definition
techniques that allow that studying of samples and a way to make generalizations about the population from which they were selected 


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Definition
set of categories; doesn't make any quantitative distinctions between observations 


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Definition
set of categories that are organized in an ordered sequence; ranks observations in terms of size or magnitude (1st, 2nd, 3rd place) 


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Definition
ordered categories that are all intervals of exactly the same size 


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interval scale with the additional feature of an absolute zero 


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the discrepancy, amount of error, that exists between a sample statistic and the corresponding population parameter 


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what is being manipulated by the researcher 


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Definition
the variable that is observed to assess the effect of treatment (independent variable) 


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consists of separate, indivisible categories; gender, occupation, academic major, number of children 


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an infinite number of possible values fall between any two observed values; time, height, weight 


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Definition
organized tabulation of the # of individuals located in each category on the scale of measurement 


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symmetrical; unimodal; mean=median=mode 


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Definition
scores tend to pile up toward one end of the scale and taper off gradually; positive and negative skew 


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Definition
statistical measure to determine a single score that defines the center of a distribution; mean, median, and mode 


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Definition
everybody has an equal chance of being selected (random assignment); each person has an equal chance of being reselected (random with replacement) 


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Definition
two different variables are observed to determine whether a relationship exists between the variables 


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Definition
one variable is manipulated while another variable is observed and measured; tries to establish a causeandeffect relationship 

