Math #9 vocabulary
Outlier
A data element that is significantly different from other elements in the data collection, or an element that appears to imply a pattern that is inconsistent with the bulk of the data evidence. An outlier should always be given careful consideration.
Histogram
A graph showing frequency of data in which the horizontal axis represents discrete units, certain ranges, or intervals while the vertical axis represents the frequency. Often, rectangular bars are drawn with their areas proportional to the frequencies within the ranges or intervals.
Box-and-whisker-plot
A graph that shows the distribution of data along a number line. Quartiles divide the data into four equal parts.
Circle graph
Also called pie chart. It is a circular graph that uses radii to divide the circle into sectors in such a way that the areas of the sectors are proportional to the quantities represented.
Scatter plot
Data that is plotted as points on a graph to show a possible relationship between two sets of data.
Measures of varation
Measures of variation are used to describe the distribution of the data. The range is the difference between the greatest and least data values. Quartiles are values that divide the data set into four equal parts.
Quartile
One of the three points that divide a set of numerically ordered data into four equal parts. These three points are called the first quartile (also called the lower quartile), second quartile (the middle quartile; it is the median), and the third quartile (upper quartile), respectively. They can be used to give us some idea of the spread of data.
Line of best fit
line of best fit Intuitively, a straight line drawn through as near as possible to the various points on a scatter diagram so as to best represent the trend.
Measures of central tendency
measures of central tendency A measure used to describe the middle or typical value of a data set. (mean, median, and mode)
Range
range The difference between the maximum and minimum values in a set of data.
