Operation Manual

Chapter 13: Inferential Statistics and Distributions 252
geometpdf(
geometpdf( computes a probability at x, the number of the trial on which the first success occurs, for
the discrete geometric distribution with the specified probability of success
p. 0p1 must be true. x can
be an integer or a list of integers. The probability density function (pdf) is:
geometpdf(p,x)
geometcdf(
geometcdf( computes a cumulative probability at x, the number of the trial on which the first success
occurs, for the discrete geometric distribution with the specified probability of success
p. 0p1 must be
true. x can be a real number or a list of real numbers.
geometcdf(p,x)
Distribution Shading
DISTR DRAW Menu
To display the DISTR DRAW menu, press y = ~. DISTR DRAW instructions draw various types of
density functions, shade the area specified by lowerbound and upperbound, and display the computed
area value.
Selecting an item from the DIST DRAW menu opens a wizard for the input of syntax for that item. Press
à for syntax editor. Some of the arguments are optional. If an argument is not optional, the cursor will
not move on to the next argument until a value is entered.
If you access any of these functions through CATALOG, the command or function will paste and you will
be required to fill in the arguments.
Color spinner menu to set the graph color is available.
To clear the drawings, select
1:ClrDraw from the DRAW menu (Chapter 8).
Note: Before you execute a
DISTR DRAW instruction, you must set the window variables so that the
desired distribution fits the screen.
MathPrint™
DISTR DRAW
1: ShadeNorm(
Shades normal distribution.
2: Shade_t(
Shades Student-t distribution.
3:
Shadec
2
(
Shades c
2
distribution.
4: ShadeÜ(
Shades Üdistribution.
fx p 1 p–
x 1–
x, 1,2,...==