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11th Standard English Medium Business Maths Subject Correlation and Regression Analysis Creative 5 Mark Questions with Solution Part - II

11th Standard

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Business Maths

Time : 00:30:00 Hrs
Total Marks : 25
    5 x 5 = 25
  1. For the following data, (i) the regression equation of X on Y regression equation of Y on X (iii) the correlation co-efficient between X and Y (iv) the value of x when y=5 (v) the value of y when x=6

  2. Ten competitors in a musical test were ranked by the judges x, y, and z in the following order.

    Rank by x 1 6 5 10 3 2 4 9 7 8
    Rank by y 3 5 8 4 7 10 2 1 6 9
    Rank by z 6 4 9 8 1 2 3 10 5 7
  3. Out the following two regression lines, find the line of regression of X on Y, 2x+3y=7 and 5x+54=9.

  4. For the following observations, find the regression co-efficient byx and bxy and hence find the correlation co-efficient (4,2)(2,3)(3,2)(4,4)(2,4).

  5. You are given the following data:

    Series x y
    Mean 18 100
    S.D 14 20

    Correlation co-efficient between x and y=0.8 (i) Find the two regression lines.
    (ii) Estimate the value of y, when x=70  (iii)Estimate the value of x, when y=90

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