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    Question

    For an experiment we have the following data set: n =

    4, ∑ X = a,∑ Y = 10,∑ XY = 21,∑ X2 = 30,∑ Y2  = 30 the correlation coefficient is -0.8 then the value of a is:
    A 8 Correct Answer Incorrect Answer
    B 7 Correct Answer Incorrect Answer
    C 10 Correct Answer Incorrect Answer
    D 9 Correct Answer Incorrect Answer

    Solution

    The correct answer is C

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