Transcript Simple Stats

Simple Statistics Using Excel
LABORATORY SKILLS TRAINING
SCI 110
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.
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).
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.
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.
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 A2:A10. If you include the title,
the average will not display.)
2. Click OK.
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
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.
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
Edit Numbers for Correct Cells
1. Place the cursor in the Number1 box and click to edit the cells.
Edit To Evaluate STDev of A2-A10
1. Enter A2:A10.
2. Click OK
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.
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.