            Z VALUE FOR THE STANDARD NORMAL DISTRIBUTION

Michael Lloyd (http://www.hsu.edu/faculty/lloydm/ti/prgmtabl.html)
Henderson State University

HISTORY
1.0 March 1994
1.1 November 1996 - translated
1.2 April 1997 - improved
1.3 August 2015 - updated file to .8xp

DESCRIPTION
Finds the z-value given the area under the standard normal
probability density function.  Each menu item asks for an area:

1-TAIL - area in one tail  (0 < area <.5)
2-TAIL - total area in both tails  (0 < area <.5)
0-z    - area between 0 and z  (0 < area <.5)
-OO-z  - area to the left of z  (.5 < area <1)
C.I.   - confidence level  (.5 < area <1)

Menu items 1- and 2-TAIL are used for hypothesis testing. The SIG. stands
for the significance level of a hypothesis test.  Menu items 0-z and -oo-z
require the areas typically found in a z area table in a statistics book.
Menu item C.I. is used for finding the critical values for a confidence
interval.

VARIABLES USED
C = area under pdf
prgmZZMENU menu for critical values
Z = z value

The critical z value for the standard normal distribution is found.

PROGRAM LISTING
"FIND z VALUE"\->\Str1:"z"\->\Str2
prgmZZMENU
invNorm(C+.5)\->\Z
Disp "z=",Z