Section B ( 52 marks )
10 . The following table shows values of x and log y .
x 2.1 4.3 6.1 8.4 9.9 log y 3.1 2.8 2.5 2.6 2.4
The relationship between equation log y �a x � b . x and log y can be modelled by the regression
( a ) Write down the value of a and of b .
( b ) Use the regression equation to estimate the value of y when x � 9 .
The relationship between x and y can be modelled using the formula y x
�k � m , where 0 k � , m � 0 .
[ 2 ]
[ 3 ]
( c ) Find the value of k and of m . [ 7 ]
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