17 . The relationship between the cost and the revenue of the products in a company is studied . The following table shows the cost x ( in USD ) of the four products in the company and the corresponding revenue y ( in USD ).
Cost ( x USD ) 3 3.5 4 4.5 5 Revenue ( y USD ) 6 8 8 13 12
It is suggested that the relationship between the variables can be modelled by x the regression equation y �a� b , where a , b� .
( a ) |
( i ) |
Write down the least square regression curve for the revenue of |
|
|
products . |
( ii ) Write down the coefficient of determination , giving the answer in five decimal places .
[ 3 ]
( b ) Write down SS res
, the sum of square residuals . [ 2 ]
2 SSres ( c ) By using R �1� , find SS tot
, the total sum of squares . SS tot
[ 2 ]
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