The z-Score Calculation Form performs z-Score calculations upon entry of a Mean, Standard Deviation, and X value or Area. The z-Score and the proportion (displayed in proportion, percent, parts per million, and parts per billion) above and below X or the value corresponding to the upper-tail area entered, for a normally distributed population, will be displayed.

The z-score is calculated by the following formula.

**File**provides the ability to Print the Graph and Text, or return to the__Main Form__.**Edit**allows__Editing Output Text__by cutting, copying, pasting, and undoing entry, and provides the abililty to Copy the Graph to the Windows Clipboard.**View**: Provides the ability to enlarge the Form size for easier viewing.**Help**provides access to this Website.

These buttons provide quick access to the following tasks.

- Returns to the
__Main Form__. - Prints the Graph and Text.
- Copies the Graph to the Clipboard.
- Copies the Selected Text to the clipboard.
- Enlarges/Reduces Form size for easier viewing.
- Brings up the
__Main Form__. - Brings up the Help file.
- Hides the form.

Enter the population Mean here.

Enter the population Standard Deviation here.

Enter the X-value of interest here.

Changes the number of decimal places, from 0 to 9. Change may be made by selecting and typing in the number, or by using the incrementing buttons.

Performs calculations and displays output.

The calculation output is displayed here when is clicked. You may save, print, edit, cut, copy, and paste text in this area.

The distribution graph is displayed here. The tail areas will be shown in Red. Double clicking on this graph will copy it to the clipboard.

The Area may be input or output as a proportion, percent, parts per million (ppm), or parts per billion (ppb) when selected.

Select if an area or value is wanted for output.

Check this to enter or find only z-scores.