11

· Table 3 shows the marks obtained by 8 students in their

Additional Maths Christmas test.

Table 3

Student A B C D E F G H

Paper 1 98 89 38 52 70 70 45 84

Paper 2 68 72 29 54 51 70 42 73

· These data are plotted on the graph given in Fig. 8 in your

Supplementary Answer Booklet.

· (i) Draw the line of best fit on this graph. [3]

· (ii) Determine the equation of the line of best fit which you

have drawn. [3]

· (iii) Work out the rank orders for the marks on each paper.

[2]

· (iv) Calculate Spearman's coefficient of rank correlation.

[4]

· (v) What significance, if any, do you attach to the value

you obtained in (iv)? [1]…read more

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