This program calculates 1 and 2 sample t or z statistical tests, and
Confidence Intervals.  (Flow chart-like inputs).  Written by Dan Watkins
----begin documentation----
Program:  CIzt
Author:  Dan Watkins (Goodman@brahms.udel.edu)
Size:  2490 bytes + variable space

This is a very self explanatory user friendly program.  It basiclly 
asks you questions (mostly yes-no) in order to define the parameters
of the Statistical test.  Once you define the parameters,  you will be 
asked for the inputs for either a test on Means or Proportions depending
on how you set up the parameters.  After the z or t test is claculated,
(if t test...degrees of freedom will be shown to help you find the
critical value if t (you need a t table) for Hypothesis testing) the
program will ask if you want a Confidence Interval you can respond Yes
or No.  If Yes you will have to specify the t or z alpha/2.

Variables defined:

Xbar= mean    [(D)= difference between two means if samples are not 
                independent.]
mu= population mean (1 sample test)
sigma= population standard deviation (z stat)
s= sample standard deviation (t test)
N= # of observations in the sample
t or z alpha/2 specifies the precision of the Confidence interval
        (need t or z table)
S^2p= Spooled Variance for 2 sample test if N1 and N2>30
df= degrees of freedom

pHat= proportion (mean/N)
pBAR= (mean1+mean2)/(N1+N2)  (2 sample test only)

CI= Confidence Interval

1= Yes
0= No

If there are any questions, Mail me at Goodman@Brahms.udel.edu
----end documentation----
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