Thread: Help with a couple of questions.

Show How:



Becomes:



I know how to do it the other way, but now it's asking me to do it this way and i'm confused.

Also, show how:

Becomes:

Lastly, show how:

Becomes:

I don't quite understand the expanding and/or simplifying i'm supposed to do. Any help is greatly appreciated.

Hey ANH13.

What is x^2? Is it a random variable or just a constant? Is it related in some way to the x_i's?

It's just x squared.

Your notation is a little confusing.

Are you trying to find sigma^2 * x^2 or are you trying to find the variance of the random variable x^2?

You need to really fix this up before we continue because it is full of ambiguities.

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