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Moving Averages
· How many points?
· Plot in the middle of the "points"
· Continue the line
· To find the next value ­ use the next
"moving average" you would get
from your line…read more

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Moving Averages…read more

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Spearmans rank
· Order both variables same way
· Find d, then d² then add all the d²
· Use the formula
· For the line of best fit ­ find both
means
· Gradient = (diff in y)/(diff in x)
· Use 1 point for y-y1 = m(x-x1)…read more

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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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