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Question
The random variables have regression lines 3x + 2y − 26 = 0 and 6x + y − 31 = 0. Calculate mean value of x and y.
Sum
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Solution
Regression lines are 3x + 2y − 26 = 0 ...(i)
6x + y − 31 = 0 ...(ii)
`(barx, bary)` satisfies the equation (i) and (ii),
∴ Solving (i) and (ii) we get,
`barx` = 4 and `bary` = 7
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Angle Between Regression Line and Properties of Regression Lines
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