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## How to Find an Interquartile Range Excel 2007

The interquartile range is a measure of how disbursed your data is around a mean. It’s normally used in conjunction with the mean and median of a data set. There are several ways to find an interquartile range (the easiest of which is probably our interquartile range calculator). However, you can also calculate the IQR in Excel 2007.

## What is an Interquartile Range?

Imagine all the data in a set as points on a number line. For example, if you have 3, 7 and 28 in your set of data, imagine them as points on a number line that is centered on 0 but stretches both infinitely below zero and infinitely above zero. Once plotted on that number line, the smallest data point and the biggest data point in the set of data create the boundaries of an interval of space on the number line that contains all data points in the set. The interquartile range is the length of the middle 50% of that interval of space.

## How to Find the TI 83 Interquartile Range

The interquartile range is the distance between the top of the lower quartile and the bottom of the top quartile. While you can use the nifty interquartile range calculator on this website, that might not be an option in a quiz or test. Finding the TI 83 interquartile range involves entering your data list and pushing a couple of buttons.

## How to Find a Five Number Summary and Create a BoxPlot on the TI-89 Graphing Calculator

A five number summary in statistics is made up of a Minimum, Median, Maximum and Q1/Q3. Q1 and Q3 help you to find the interquartile range: an important factor in looking at the spread of data. When you create a box plot with whiskers on the TI-89, the TI-89 will automatically calculate the five number summary for you, saving you time and effort.