CDF
Given a Z value, CDF command
calculates the area under the normal distribution curve to the
left of the specified z(Z<=z). If m
and standard deviation s are not specified,
a standard normal distribution( s=1, m=o),
is assumed. If X has the N(m,s) distribution,
then the standardized variable z=(X-m)/s has the standard normal distribution N(0,1) .
The
proportion of soldiers have head circumference greater than 23.9
inches( Section 1.3 Exercises 1.62 in BPS page 64) can be found
by selecting Calc--> Probability Distributions-->Normal
and filling in the dialog as shown.
The
result is stored in constant k1, which can be viewed by opening
Info window. However, k1 is the proportion of soldiers
have head circumference less and equal to 23.9 inches, which is
not appropriate result we want. What we really want is the proportion
of soldiers have head circumference greater than 23.9 inches,
which is "1-k1". Use command LET to get it.
MTB>let k2=1-k1
Then we can view k1 and k2 in
Info window, which shown as below.
Or by using command PRINT to read any data or constant in session window.
MTB>print k1 k2
Session window shows as below.
