Excel

For MATH 125

Computing Statistics

Useful linkUseful link

• Surfstat: (an online text in introductory Statistics)

http://surfstat.anu.edu.au/surfstat-home/surfstat-main.html

Computing descriptive statistics in ExcelComputing descriptive statistics in Excel

Two ways:

1. Use the formula palette – click on the fx button: This makes use of the many Excel built-in functions (Average, Stdev, Median, etc…)

2. Use the Data Analysis Toolpak & select Descriptive Statistics

Built-in Functions

• Most, if not all, of these functions are built into Excel=average(range) where range can be like C3:C40

=median(range)

=percentrank(range,value)

=quartile(range,which quartile)

=min(range)

=max(range)

Descriptive Statistics tool

Input range:

sequence of cells containing the data

Label in First row

Output range:

tell Excel where to display the output

Summary statistics:

box to be checked

Data: Table 1.10

Recap:

Step by step:

• Open an Excel worksheet and paste or import a data set into a column.

• Click on the tab “Data Analysis”, and choose “Descriptive Statistics”

Just like for Histograms:• In “Input Range” enter the range or highlight your data column.• In “Output Range” click on a remote cell where you want the output

to appear.• Check “Summary Statistics” box• Click “OK”.

• The output will consist in several statistics, including: Mean, Median Mode, Minimum, Maximum, and Count

Using Excel to find the standard deviation:

Step by step:

• Start Excel

• Type in a cell: =STDEV(data)

• That’s it!

Better:

• Use the Data Analysis ToolPak to get full Statistics (Min, Max, Stdev, Mean, Median, etc…)