Fundamental Statistics for the Behavioral Sciences (4e)
by David C. Howell

Probabilities for the Normal Distribution

This applet may be used to answer many of the exercises in Section 6.6, pp. 100-103. When this page initially loads, the applet is set for Exercise 6.3 (a) on p. 101. 		  Return to Normal Probability Page

Return to Main Page of Seeing Statistics Examples

  How-To:

Enter beginning and ending z-scores in the Start and End boxes. The figure is redrawn and the new probability is calculated after hitting the return key while the cursor is in one of the boxes.

For open-ended ranges (e.g., finding the proportion of the counts that will lie below 195 as in Exercise 6.3.b), use a very large number for the other end.

For other exercises, change the numbers in the Mean and StDev boxes to match the particular problem and then enter the appropriate Start and End values. Remember to hit the Return key in the last box you enter to start the calculations and redrawing.

  Return to Normal Probability Page

Return to Main Page of Seeing Statistics Examples

WARNING: The graph above gives accurate normal probabilities suitable for educational purposes such as homework problems. It is not intended for and should not be used for any calculations which have any major consquences for health, safety, financial matters, etc.

The above applet is from the section "Working with the Normal Distribution" in Seeing Statistics by Gary McClelland. For more information, visit Seeing Statistics

© 1999, Duxbury Press