Section A ( 40 marks )
1 . The following table shows the final exam scores for given midterm test scores in a group of six students .
Midterm test scores ( x ) |
60 |
65 |
70 |
72 |
78 |
81 |
Final exam scores ( y ) |
50 |
48 |
70 |
68 |
79 |
91 |
( a ) The relationship between the variables is modelled by the regression equation y �ax � b .
( i ) Find the correlation coefficient .
( ii ) Write down the value of a and of b . [ 4 ]
( b ) Estimate the final exam score of a student whose midterm test score is 84 .
[ 2 ]
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