SOCR EduMaterials Activities Binomial PGF
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* '''Exercise 1:''' Use SOCR to graph the PGF's and print the following distributions and answer the questions below. Also, comment on the shape of each one of these distributions: | * '''Exercise 1:''' Use SOCR to graph the PGF's and print the following distributions and answer the questions below. Also, comment on the shape of each one of these distributions: | ||
| - | **a.<math> X \sim Bernoulli(0. | + | **a.<math> X \sim Bernoulli(0.1) </math> |
| - | **b.<math> X \sim Binomial( | + | **b.<math> X \sim Binomial(10,0.9) </math> |
| - | **c.<math> X \sim Geometric(0. | + | **c.<math> X \sim Geometric(0.3) </math> |
| - | **d.<math> X \sim NegativeBinomial( | + | **d.<math> X \sim NegativeBinomial(10, 0.7) </math> |
Below you can see a snapshot of the PGF of the distribution of <math> X \sim Bernoulli(0.8) </math> | Below you can see a snapshot of the PGF of the distribution of <math> X \sim Bernoulli(0.8) </math> | ||
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Do you notice any similarities between the graphs of these PGF's between any of these distributions? | Do you notice any similarities between the graphs of these PGF's between any of these distributions? | ||
| - | * '''Exercise 2:''' Use SOCR to graph and print the PGF of the distribution of a geometric random variable with <math> p=0. | + | * '''Exercise 2:''' Use SOCR to graph and print the PGF of the distribution of a geometric random variable with <math> p=0.1, p=0.8 </math>. What is the shape of this function? What happens when <math> p </math> is large? What happens when <math> p </math> is small? |
* '''Exercise 3:''' You learned in class about the properties of PGF's If <math> X_1, ...X_n</math> are iid. and <math>Y = \sum_{i=1}^n X_i. </math> then <math>P_{y}(t) = {[P_{X_1}(t)]}^n</math>. | * '''Exercise 3:''' You learned in class about the properties of PGF's If <math> X_1, ...X_n</math> are iid. and <math>Y = \sum_{i=1}^n X_i. </math> then <math>P_{y}(t) = {[P_{X_1}(t)]}^n</math>. | ||
Revision as of 06:57, 9 January 2008
This is an activity to explore the Probability Generating Functions for the Bernoulli, Binomial, Geometric and Negative-Binomial Distributions.
- Description: You can access the applets for the above distributions at http://www.socr.ucla.edu/htmls/SOCR_DistributionFunctors.html .
- Exercise 1: Use SOCR to graph the PGF's and print the following distributions and answer the questions below. Also, comment on the shape of each one of these distributions:
- a.
- b.
- c.
- d.
- a.
Below you can see a snapshot of the PGF of the distribution of 
Do you notice any similarities between the graphs of these PGF's between any of these distributions?
- Exercise 2: Use SOCR to graph and print the PGF of the distribution of a geometric random variable with p = 0.1,p = 0.8. What is the shape of this function? What happens when p is large? What happens when p is small?
- Exercise 3: You learned in class about the properties of PGF's If X1,...Xn are iid. and
then ![P_{y}(t) = {[P_{X_1}(t)]}^n](/socr/uploads/math/4/4/7/44715cd09714f0e09436cdd22aa5b660.png)
.
- a. Show that the PGF of the sum of n independent Bernoulli Trials with success probability p is the same as the PGF of the Binomial Distribution using the corollary above.
- b. Show that the PGF of the sum of n independent Geometric Random Variables with success probability p is the same as the MGF of the Negative-Binomial Distribution using the corollary above.
- c. How does this relate to Exercise 1? Does having the same PGF mean they are distributed the same?
See also
- SOCR Home page: http://www.socr.ucla.edu
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