USING EXCEL TO CONVERT RAW SCORE TO Z SCORE

Z= X−MSD

1. Enter your raw scores in a column in an Excel worksheet.

2. Calculate mean and standard deviation for the set of raw scores. Click on data in tool bar and data-analysis (make sure you have the Analysis ToolPak loaded in

Excel).

Click Descriptive Statistics, OK

Click Input Range. Highlight the cells containing the raw scores, B1 to B8. Make sure the box next to Labels in first row is clicked.

Click Output Range and click in the Output Range box. Click a cell a couple of rows below raw data.

Click box next to Summary statistics and click OK. The mean is 3.71 and the standard deviation is 1.60.

3. Next step is to create the formula to convert the raw scores to Z scores.

Remember the formula for converting a raw score to a Z score is

Z= X−MSD

We will be typing this formula into the formula window.

Click cell C2 and type = in the cell. This activates the cell to create the formula.

Click cell B2 and type – 3.71. (This is X-M).

In the formula window place parentheses around B2-3.71.

Behind =(B2-3.71) type /1.60. This is the standard deviation for our raw scores. Hit Enter.

Right click on cell C2 and choose Copy.

Highlight cells C3 to C8. Right click again and choose Paste.

The Z scores will appear in column C.