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    pop000's Avatar
    pop000 Posts: 352, Reputation: 6
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    #1

    Mar 7, 2011, 02:09 PM
    find the Variance
    is known that the Tomato crop (in ton) in some farm are Sampled for 10 years.
    the Standard deviation of the crop was 2 ton.
    the Income (Y) from the Tomato Depends on the crop (X)
    according to following connection Y=3X-2. the Variance Income from the Tomato in this Sampled is ?

    if I know that the Standard deviation is 2 so I just need to do 2^2 to get the Variance yes?

    and 1 more Question: the Value of Pearson product-moment correlation coefficient between the crop and the Income is?
    how I can solve it?

    thanks for help.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Mar 7, 2011, 10:54 PM

    I would say that you're right, variance = (standard deviation)^2.

    For the Pearson product-moment correlation coefficient, sorry, I'm not sure about this. Wikipedia has a nice article about it, but I rather not suggest anything just in case I'm telling something completely wrong.

    Pearson product-moment correlation coefficient - Wikipedia, the free encyclopedia
    pop000's Avatar
    pop000 Posts: 352, Reputation: 6
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    #3

    Mar 8, 2011, 05:43 AM
    Comment on Unknown008's post
    OK so I can say that the variance here is 4?

    Thank you.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Mar 8, 2011, 05:55 AM

    Yes, that's what I meant :)
    pop000's Avatar
    pop000 Posts: 352, Reputation: 6
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    #5

    Mar 8, 2011, 09:30 AM
    Comment on Unknown008's post
    Cool thanks again.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #6

    Mar 11, 2011, 04:42 AM

    I just realised that the question was asking for the variance of income Y when given the standard deviation of crop X. Sorry for that >.<
    pop000's Avatar
    pop000 Posts: 352, Reputation: 6
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    #7

    Mar 11, 2011, 06:55 AM
    Comment on Unknown008's post
    That is OK.
    We all do mistake sometime. :)
    But still thank you.
    You one of the most helper here.
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