Simple Statistics Using Excel

1
Simple Statistics Using Excel

• LABORATORY SKILLS TRAINING
• SCI 110

2
Introduction

• The following slides are just a few data points
  measuring pressure in mmHg, and will serve as a
  good example.
• The screenshots are fairly accurate except for
  some reason when a dialog box is open in Excel,
  some information is not visible in the
  screenshot.
• Follow through each screenshot to be able to
  determine the statistical information need for
  your lab reports.

3
Enter Data Use a Function
1. Open a new spreadsheet in Excel.
2. Enter your title on the top line and data
points in the column, one per cell.
3. Click in a cell below the data you wish to
display the average (A12).
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Find the Average of Cells A2-A10
1. Place the cursor on fx symbol and click, you
will see an sign appear in the cell and in the
white space. The dialog box below will open.
2.Click on Average and then click OK.
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Find the Average of Cells A2-A10
1. Check the cell numbers that are to be averaged
and make sure they are correct. 2. These are not,
so place the cursor in the space and click to
activate edit.
6
Find the Average of Cells A2-A10
1. Change the numbers to include all the numbers
you want to average. (For this example, we will
average cells A2A10. If you include the title,
the average will not display.)
2. Click OK.
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Your Page Should Look Like This
1. The formula will be displayed in the white
space.
2. The mean value will be displayed in cell A12
and
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Type a Title Add Another Function
2. Click in cell A13, then click on fx to add
your next function.
1. Type the title Average in the cell adjacent
to the average for identification.
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Find the Standard Deviation of A2-A10
1. To find the Standard Deviation (STDev), first
select the Statistical functions
2. Search the list, select STDev.
3. Click OK
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Edit Numbers for Correct Cells
1. Place the cursor in the Number1 box and click
to edit the cells.
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Edit To Evaluate STDev of A2-A10
1. Enter A2A10.
2. Click OK
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Your Page Should Look Like This
The mean and standard deviation for this set of
data is written as 766.5245 0.247228, the
smaller the STDev the better the data!
1. Give a title to the cell to identify the STDev.
2. Now you are ready to present the mean and
standard deviation in your lab report.
13
Keep Adding More Functions

• Find all of the rest of the statistics that you
  need by repeating the steps.
• Scroll through the different functions to see
  what else you should report as statically
  important information.
• Make sure to discuss your statistical
  interpretation of the data in the Summary portion
  of your lab report.