In statistics, the fivenumber summary is an important set of information because it is the base from which people may analyze data. It includes the sample minimum, or the smallest observation; the median, or middle value; the lower quartile, or the average of the smaller half; the upper quartile, or average of the larger half; and the sample maximum, or the largest observation. Though it is possible to calculate this information by hand, many people now use graphing calculators like the TI83 to acquire the information quickly.

Enter the data by using the STAT menu on the TI83. Press "STAT" and then select "Edit" from the menu. Press "Enter" and then use the arrow keys to navigate to an empty, or unnamed, column. Type a title for the number set and press "Enter" to save it. Use the down arrow key to enter the specific numbers, pressing "Enter" after each separate number until you have completed the data set.

Press "STAT" and the right arrow key to display the menu. Choose "VarStats" from the menu and press "Enter."

Choose the column number for your data list from the new screen that appears. If you entered your data into the first column, choose L1. If you entered the data into the third column, choose L3, and so on. Once you have chosen the correct data list, click "Enter."

Examine the new screen that appears with a list with 11 numbers. The fivenumber summary is the final five numbers on the list. The minimum is signified by "minx," the lower quartile by "Q1," the Median by "Med," the upper quartile by "Q3" and the Maximum Value by "maxX."
References
 National Council of Teachers of Mathematics: FiveNumber Summary
 Mr. Page: 5 Number Summary TI83 Help
 TC3; Sample Statistics on TI83/84; Stan Brown
 "The Basic Practice of Statistics, 5th ed."; David Moore; 2000
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