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18 Cards in this Set
- Front
- Back
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Continuous Data
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data that may progress from one class to the next without a break and may be expressed by either whole numbers or fractions
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Cumulative Frequency Distribution
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a tabular display of data showing how many observations like above, or below, certain values
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Data
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a collection of any number of related observations on one or more variables
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Data Array
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the arrangement of raw data by observations in either ascending or descending order
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Data Point
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a single observation from a data set
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Data Set
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a collection of data
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Discrete Classes
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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
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Frequency Curve
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a frequency polygon smoothed by adding classes and data points to a data set
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frequency distribution
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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
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frequency polygon
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a line graph connecting the midpoints of each class in a data set, plotted at a height corresponding to the frequency of the class
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histogram
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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
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ogive
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a graph of a cumulative frequency distribution
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open-ended class
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a class that allows either the upper or lower end of a quantitative classification scheme to be limitless
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population
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a collection of all the elements we are studying and about which we are trying to draw conclusions
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raw data
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information before it is arranged or analyzed by statistical methods
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relative frequency distribution
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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
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representative sample
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a sample that contains the relevant characteristics of the population in the same proportions as they are included in that population
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sample
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a collection of some, but not all, of the elements of the population under study, used to describe the population
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