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Graphical Methods and StatisticsVocabulary

average The sum of a set of numbers divided by how many numbers are in the set. It is also called the mean or arithmetic average.
bar graph A graph that organizes a collection of data by using horizontal or vertical bars to display how many times each event or number occurs in the collection.
box-and-whisker plot A diagram that uses a box to represent the middle of a set of data and segments to the extremes of both ends.
cluster Data that are grouped closely together.
frequency table A table for organizing a set of data that shows the number of times each item or number appears. It is also called frequency distribution.
histogram A bar graph in which the bars represent equally spaced intervals of numbers.
interquartile range The range of the middle half of numbers.
interval The difference between successive values on a scale.
leaf The second greatest place value of data in a stem-and-leaf plot.
line graph A graph that shows trends over intervals of time.
line plot A diagram showing the frequency of data over a number line. An x is marked above a number on a number line each time that number occurs in a set of data.
lower extreme the least number of a set of data. (abbreviated LE)
mean The sum of a set of numbers divided by how many numbers are in the set. It is also called the average or arithmetic average.
median The middle number of a group of numbers listed in order. If the data is even, the median is the mean of the two middle numbers.
mode The number that occurs most often in a given collection of numbers.
negative correlation Data points on a scatter plot whose y-coordinates tend to DECREASE as the x-coordinates increase.
no correlation Data points on a scatter plot for which no pattern exists among the x- and y- coordinates.
outlier Data that is more than 1.5 times the interquartile range from the quartiles
positive correlation Data points on a scatter plot whose y-coordinates tend to INCREASE as the x-coordinates increase.
quartile One of four equal parts of data.
range The difference between the greatest number and the least number in a set of data.
scale The set of all possible values of a given measurement, including the least and the greatest numbers in the set, separated by the intervals used.
scatter plot A graph or diagram in which two sets of related data are plotted as ordered pairs on the same graph.
stem The greatest place value common to all the data values in a stem-and-leaf plot.
stem-and-leaf-plot A method of organizing data in increasing or decreasing order - where the greatest place value of the data forms the stem and the next greatest place value forms the leaves.
upper extreme The greatest number in a set of data. (abbreviated UE)
upper quartile The median of the upper half of a set of data.
Created by: DDavis