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18 Cards in this Set

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Continuous Data
data that may progress from one class to the next without a break and may be expressed by either whole numbers or fractions
Cumulative Frequency Distribution
a tabular display of data showing how many observations like above, or below, certain values
Data
a collection of any number of related observations on one or more variables
Data Array
the arrangement of raw data by observations in either ascending or descending order
Data Point
a single observation from a data set
Data Set
a collection of data
Discrete Classes
Data that do not progress from one class to the next without a break; that is, where classes represent distinct categories or counts and may be represented by whole numbers
Frequency Curve
a frequency polygon smoothed by adding classes and data points to a data set
frequency distribution
an organized display of data that shows the number of observations from the data set that falls into each of a set of mutually exclusive and collectively exhaustive classes
frequency polygon
a line graph connecting the midpoints of each class in a data set, plotted at a height corresponding to the frequency of the class
histogram
a graph of a data set, composed of a series of rectangles, each proportional in width to the range of values in a class and proportional in height to the number of items falling in the class, or the fraction of items in the class
ogive
a graph of a cumulative frequency distribution
open-ended class
a class that allows either the upper or lower end of a quantitative classification scheme to be limitless
population
a collection of all the elements we are studying and about which we are trying to draw conclusions
raw data
information before it is arranged or analyzed by statistical methods
relative frequency distribution
the display of a data set that shows the fraction or percentage of the total data set that falls into each of a set of mutually exclusive and collectively exhaustive classes
representative sample
a sample that contains the relevant characteristics of the population in the same proportions as they are included in that population
sample
a collection of some, but not all, of the elements of the population under study, used to describe the population