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How to Calculate Central Tendencies with GeoGebra

In this entry I’ll show you how you can use GeoGebra to find: Minimum, maximum, quartiles, median, mode, mean or standard deviation when you have a list of raw data. You can also find them individually by using commands.

The mode does not show up if you use One Variable Analysis GeoGebra icon. You have to use a command to find it instead.

GeoGebra Instruction 1

Using One Variable Analysis GeoGebra icon

1.
Open Spreadsheet under GeoGebra icon View in GeoGebra icon Menu.
2.
Enter you data in column A.
3.
Select all cells with data in them.
4.
Click One Variable Analysis GeoGebra icon.
5.
Now you get a window with a chart. Click the Show Statistics GeoGebra icon button. If you can’t see the button, click the small triangle in the top right corner of the new window.
6.
Now you get a table showing these statistics:

  • σ = standard deviation (population)

  • s = standard deviation (sample),

  • Min = mininum,

  • Max = maximum,

  • Q1 = the first quartile,

  • Q3 = the third quartile.

The median and mean are also provided.

GeoGebra Instruction 2

Using Commands

  • Open Algebra View and Spreadsheet under GeoGebra icon View in GeoGebra icon Menu.

  • Enter you observations in column A in Spreadsheet. Select all your cells and click List GeoGebra icon in Toolbar. Change Name to Data and click OK. The list will be saved in Algebra View.

  • To find the minimum, use the command

    Min(<List>)

    or

    Min(<List of Data>, <List of Frequencies>)

  • To find the first quartile, use the command

    Quartile1(<List of Raw Data>)

    or

    Quartile1(<List of Numbers>, <List of Frequencies>)

  • To find the median, use the command

    Median(<List of Raw Data>)

    or

    Median(<List of Numbers>, <List of Frequencies>)

  • To find the third quartile, use the command

    Quartile3(<List of Raw Data>)

    or

    Quartile3(<List of Numbers>, <List of Frequencies>)

  • To find the maximum, use the command

    Max(<List>)

    or

    Max(<List of Data>, <List of Frequencies>)

  • To find the mode, use the command

    Mode(<List of Numbers>)

  • To find the mean, use the command:

    mean(<List of Raw Data>)

  • To find the variance, use the command

    Variance(<List of Numbers>)

  • To find the standard deviation, use the command

    stdev(<List of Raw Data>)

    to get the standard deviation of a sample, or

    stdevp(<List of Raw Data>)

    to get the standard deviation of a population.

Screenshot of GeoGebra showing statistical attributes of a data sample

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