# z Score Calculations - Form

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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.

### Menu

**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.

### Speed Buttons

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.

### Mean

Enter the population Mean here.

### Standard Deviation

Enter the population Standard Deviation here.

### X-Value

Enter the X-value of interest here.

### Decimal Place Change

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.

### Action Button

Performs calculations and displays output.

### Output Text

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

### Distribution Graph

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.

### Proportion Selection

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

### Area or Value

Select if an area or value is wanted for output.

### z Only

Check this to enter or find only z-scores.