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Unit 6 Statistics Vocabulary
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Key Concepts:
Terms in this set (14)
Frequency
The number of times a value appears in a set of data.
frequency table
A table used to show the number of times something occurs.
Dot Plot(Line Plot)
A display of data that is along a number line with points, or symbols, indicating the frequency of information about a single question or category.
Histogram
A type of bar graph used to display numerical data grouped in equal intervals. Itshows the number of data items that occur within each interval.
Box-and-Whisker Plot (box plot)
A diagram that summarizes a set of data using the median, the first and third quartiles, and the extreme values (five number summary)
Interquartile Range (IQR)
The difference between the upper and lower quartiles. It indicates the spread of the middle 50% of the data.
Measures of Spread
A number that indicates the variability of the data. Ex. Range, IQR (inner quartile range), MAD (Mean Absolute Deviation)
Range
The difference between the highest and lowest values in a set of data.
Measures of Center
A number that describes the middle or center of the data.Examples: mean, median, mode.
Median
The middle number when a set of data is arranged in order.
Mean
The "average" of a set of data, found by adding all pieces of data and dividing by the number of data items.
Mode
The number that occurs the most in a set of data.
Outlier
A value that is far away from most other values in a data set. The valueis much higher or much lower than the rest of the data values.
Bell Curve
distribution of scores in which the bulk of the scores fall toward the middle, with progressively fewer scores toward the "tails" or extremes
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