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# Statistics Vocab 1A

### Part A of Ch.1 Vocabulary

TermDefinition
DATA are values associated with a trait or property that help distinguish the occurrences of something
DATA is the set of individual values associated with a variable.
DATUM is the singular form of data. It refers to a single data point or observation.
DATA is a set or collection of values. It is the plural form of data.
VARIABLE is a characteristic of an item or individual.
OPERATIONAL DEFINITION must have one for each variable used. An operational definition is a commonly understood definition.
OPERATIONAL DEFINITION allows all associated with the analysis to understand what the variable represents and what its possible values are.
TYPES OF VARIABLES categorical and numerical.
CATEGORICAL VARIABLES qualitative variables – have values that can only be placed into categories.
NUMERICAL VARIABLES quantitative variables – have values representing quantitites.
Types of Numerical Variables discrete and continuous
DISCRETE Numerical Variables have numerical values arising from the counting process. The numerical values are whole numbers.
CONTINUOUS Numerical Variables have numerical values arising from a measuring process. The response takes on any value within a continuum or interval.
POPULATION consists of all the items or individuals about which you want to reach conclusions.
SAMPLE is a portion of a population selected for analysis.
PARAMETER is a measure that describes a characteristic of a population.
STATISTIC is a measure that describes a characteristic of a sample.
Created by: koehlercenter