## Stat Ch. 1

Last update by hmwestie on 02/01/2012
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# a numerical summary of a population

parameter

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variables that allow for classification of individuals based on some attribute or characteristic
qualitative variables
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variables that provide numerical measures of individuals; arithmetic operations such as addition and subtraction can be performed on the values and will provide meaningful results
quantitative variables
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a quantitative variable that has either a finite number of possible values or a countable number of possible values
discrete variable
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a quantitative variable that has an infinite number of possible values that are not countable
continuous variable
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the values of the variable name, label, or categorize; the naming scheme does not allow for the values of variable to be arranged in a ranked or specific order
nominal level of measurement
• Answered in Stat Ch. 1
the naming scheme allows for the values of the variable to be arranged in a ranked or specific order
ordinal level of measurement
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has a value of zero that does not mean the absence of the quantity; arithmetic operations such as addition and subtraction can be performed on values of the variable
interval level of measurement
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has a value of zero that means the absence of quantity; multiplication and division can be performed on the variables' values
ratio level of measurement
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a study that measures the value of response variable without attempting to influence the value of either the response or explanatory variables; the researcher observes the behavior of the individuals in the study without trying to influence the outcome of the study
observational study
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an experiment where the researcher assigns the individuals in a study to a certain group, intentionally changes the value of an explanatory variable, and then records the value of the response variable for each group
designed experiment
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the effects of two or more explanatory variables are not separated; any relation that may exist between an explanatory variable and the response variable may be due to some other variable or variables no accounted for in the study
confounding
Stat Ch. 1
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