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Thread: Help with a couple of questions.

  1. #1
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    Red face 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.
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  2. #2
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    Re: Help with a couple of questions.

    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?
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  3. #3
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    Re: Help with a couple of questions.

    It's just x squared.
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  4. #4
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    Re: Help with a couple of questions.

    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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