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Layali Statistics Math Terms
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Terms in this set (20)
Math Terms
Definition
bar chart
A graph used to display categorical data. Every bar represents a different category. The vertical scale for heights is labeled with the count or percent for each category
uniform
uniform distribution is a distribution of data in which the alues of the variable occur approximately the same number of times.
range
In statistics, the total length of the interval coered by the distribution, from the maximum to minimum values. Range = maximum value - minimum value.
mode
The data item in a set that occurs the most often. A data set may have no mode, one mode, or more than one mode.
dot plot
A graphic display of data arrange in columns above a horizontal number line, using a single dot to represent each data item. A dot plot is similar to a line plot
symmetrical
The shape of a distribution is symmetrical when the two halves are the same.
skewed
In statistics, the shape of a distribution that occurs when one side is longer than the other side.
stem plot
A data display that shows each data value in two parts according to its place value. The stem represents the first digit or digits, and the leave represents the last digit of the number. A legend shows how to read the values.
mean
The arithmetic average of a set of data found by taking the sum of the data and then dividing by the total number of data items.
outliers
Data points in a set of data that do not fit the overall pattern of the data set.
median
The middle number of a set of data in numerical order
mean absolute deviation
The mean (average ) of the sums of the absolute values of the diffrence between each data point and the chosen measure of central tendency (using the mean).
interquartile range
The difference between the lower and upper quartiles of a set of ordered data.
quartiles
Values that divide a distribution into four groups, each having an equal number of observations.
five-number summary
This summary includes the minimum, first quartile, median, third quartile, and maximum. The information in a five-number summary is used in making and interpreting box-and-whisker plots.
box plot
A data display organized into four sections, each representing 25% of the data. Also known as a box-and-whisker plot
histogram
A graph used to show the frequencies for the set of data. The horizontal axis is divided into equal intervvals. The vertical axis shows the frequency, or the number of items, in each interval.
frequency table
A table that displays the possible values of a variable along with the frequency or number of times that value occurs.
class intervals
Class intervals are groups into which the possible values of a range of data are divided; for example the division of data on a bar chart or histogram.
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