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Math Help - Describing data.

  1. #1
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    Describing data.

    please please help me out for these question below. They are very important to me. As I am not good on Statistic and I don't have the model answers for them, I really want someone who can show me the answers about them. Therefore, I can check if i was doing the questions in the right way.

    Don't have to do all of them, just please do the one you know. Thank you very much!!!

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    Question 2---Suppose that we have data x1, . . . , xn.
    (a) Name two measures of the location of the data, and explain how they are calculated.
    Explain which of these is more appropriate if the data consist of the annual
    income of n people.

    (b) Name two measures of the spread of the data, and explain how they are calculated.

    (c) For i = 1 . . . , n, let yi = axi + b, where a and b are constants and a is not equal to 0. Let (mean of x)x and (standard deviation of x) sx be the sample mean and sample standard deviation, respectively, of x1, . . . , xn, and let y and sy be the sample mean and sample standard deviation, respectively, of y1, . . . , yn. Find y and sy in terms of x and sx.
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    Last edited by mr fantastic; April 30th 2010 at 04:08 PM. Reason: Re-titled.
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