Statistics Vocabulary

1.  Statistics – is the study of numerical data. These data are collections of related numerical information, such as sports scores and records, election results, real estate sales, and grades on Regents exams.


2. Stem-and-leaf plot – is a displays that shows each data value.


3.  Frequency histogram – is used to display grouped data and is similar to a vertical bar graph.  The widths of all the bars are equal and represent equal intervals.  The frequency for each interval is represented by the height of its bar.  Just as there are no gaps between intervals, there should be no gaps between bars.


4.  Bar graph – looks like a histogram.  However, the height or length of each bar represents an amount, or value, rather than a frequency.  The greater the value, the longer or higher the bar.  A bar graph can be vertical or horizontal.


5.  Line graph – is used to describe a trend, or changes over time, for one particular item.  The horizontal axis is a number line showing time.  The vertical axis shows numeric amounts.


6. Scatter plot – relates tow sets of data.  Usually, both the vertical axis and the horizontal axis show numeric amounts.


7.  Circle graph – shows how percents or parts of a whole are distributed.  The whole circle always represents 100% of the data.