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Choose the correct option.

If the lines of regression are parallel to coordinate axes, then the coefficient of correlation is:

• (a)1
• (b)0
• (c)$-1$
• (d)$\frac{1}{2}$

Answer

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From ISC 2021 Specimen Mathematics Paper 1, question 19(ii).

Check your working with the Regression lines calculator: both regression lines, b_yx, b_xy and r from data, summary sums or the two lines; with estimates.