The two lines of regression are 3x+2y=26 and 6x+y=31 then the mean of x is :
Because both regression lines pass through the point of means (x̄, ȳ), we solve the system of linear equations 3x + 2y = 26 and 6x + y = 31 simultaneously. Multiplying the…
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The two lines of regression are 3x+2y=26 and 6x+y=31 then the mean of x is :
Answer and explanation
Correct answer B
Because both regression lines pass through the point of means (x̄, ȳ), we solve the system of linear equations 3x + 2y = 26 and 6x + y = 31 simultaneously. Multiplying the second equation by 2 gives 12x + 2y = 62; subtracting 3x + 2y = 26 yields 9x = 36, so the mean of x is x̄ = 4 (and ȳ = 7).
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