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  3. 50 points let xi y1 2 2 3 3 xn yn represent n pair

50 points Let xi y1 2 2 3 3 Xn yn represent n pairs of...

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50 points Let xi y1 2 2 3 3 Xn yn represent n pairs of data points The variable X is x1 x2 X3 Xn The variable Y is y y2 y3 yn The scatter plot and the least squares line are given below A Find the equation of the least squares line No need to be very accurate B If the mean of variable Y is 113 73 and the sum of the squares of all items of variable X is 36 797 00 find the standard deviation of variable X C If the sum of the squares of all items of variable Y is 232 916 00 find the standard deviation of variable Y D What is the coefficient of determination of the least squares line 250 Y 200 150 100 50 0 L 0 Y 20 40 X 60 O 80 100

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