Difference between revisions of "SOCR EduMaterials FunctorActivities MGF Moments"
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* '''Exercise 2:''' Can you use MGF's to find the Expected Value for the Continuous Uniform Distribution? Why or why not? | * '''Exercise 2:''' Can you use MGF's to find the Expected Value for the Continuous Uniform Distribution? Why or why not? | ||
| − | * '''Exercise 3:''' In Exercise 1, we calculated the 1^{st} Moment. If we take the second derivative of the MGF with respect to t, where <math> t=0 </math>. We get <math> E(X^2) </math>. We can use this to find the Variance of a particular Distribution. Repeat Parts (a,b,c) for Exercise 1, but this time calculate the variance. | + | * '''Exercise 3:''' In Exercise 1, we calculated the <math>1^{st}</math> Moment. If we take the second derivative of the MGF with respect to t, where <math> t=0 </math>. We get <math> E(X^2) </math>. We can use this to find the Variance of a particular Distribution. Repeat Parts (a,b,c) for Exercise 1, but this time calculate the variance. |
| − | * '''Exercise 4:''' What do we get when we take the 3^{rd} and 4^{th} derivatives of a MGF and set <math> t=0 </math>? | + | * '''Exercise 4:''' What do we get when we take the <math>3^{rd}</math> and <math<4^{th}</math> derivatives of a MGF and set <math> t=0 </math>? |
Revision as of 22:31, 8 January 2008
This is an activity to explore useful properties of MGF's.
- Description: You can access the applets for the above distributions at http://www.socr.ucla.edu/htmls/SOCR_DistributionFunctors.html .
- Exercise 1: As you have learned in class, there are quite a few interesting properties that Moment Generating Functions hold. For example you learned that \( E(X^n)=M_{x}^{(n)}(0)={d^n M_x(t)\over{dt^n}}\mid_{t=0} \) If the MGF is defined in the neighborhood of 0. So to get the Expected Value for a particular distribution, you would take the first derivative of the MGF and set t=0. Use SOCR to graph and print the following distributions and answer the questions below. You must do these exercises using MGF's, you can find the slope using the mouse pointer.
- a. Find the Expected Value of \( X \sim Binomial(10,.5) \)
- b. Find the Expected Value of \( X \sim Normal(0,1) \)
- c. Find the Expected Value of \( X \sim ChiSquare(13) \)
- Exercise 2: Can you use MGF's to find the Expected Value for the Continuous Uniform Distribution? Why or why not?
- Exercise 3: In Exercise 1, we calculated the \(1^{st}\) Moment. If we take the second derivative of the MGF with respect to t, where \( t=0 \). We get \( E(X^2) \). We can use this to find the Variance of a particular Distribution. Repeat Parts (a,b,c) for Exercise 1, but this time calculate the variance.
- Exercise 4: What do we get when we take the \(3^{rd}\) and <math<4^{th}</math> derivatives of a MGF and set \( t=0 \)?
