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114. the regression lines are 3x+ 5y -42 = 0 and 2x + y - 80 0. estimate of y when x = 10 will be a sai4a tar 3x + 5y 42 = 0 ti 2x +y - 80 = 0. x = 10 y (1) o-4
114. The regression lines are 3X+ 5Y -42 = 0 and 2X + Y - 80 0. Estimate of Y when X = 10 will be a sai4a tar 3X + 5Y 42 = 0 TI 2X +Y - 80 = 0. X = 10 Y (1) O-4 (2) 1-4 (3) 2:4 (4) 3:4
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Nidhi taparia![best-answer]()
There is a serious error in the way this question has been written. Two regression lines mean one line is the regression of Y on X (where X is independent variable and Y is dependent) and the other is regression of X on Y (where Y is independent variable and X is dependent). These two lines meet at the mean values of X and Y. But when we are to find out the value of one variable when the other is known, we must be told which of these two lines is Y on X and X on Y. Given the options, the first line : 3X + 5Y - 42 = 0 is the regression of Y on X and that will lead us to know value of Y when X = 10. Simply put X = 10 in the equation and we'll get Y = 2.4. So the option (3) is correct.