Page 149 - TBIS_15194-2019_(EN)_3nd
P. 149
TBIS 15194:2019
Then a may be found by substitution:
EXAMPLE The following four values of x and y are noted during a test, from which:
2
，Σxy，Σx , x and y are calculated as shown:
No. X（pedal force，N） Y（braking force，N）
1 90 90
2 150 120
3 230 160
4 300 220
Sum Σx=770 Σy=590
Mean X=192.5 Y=147.5
2
No. XY X
1 8100 8100
2 18000 22500
3 36800 52900
4 66000 90000
2
Sum Σxy=128900 ΣX =173500
The line of best fit is therefore:
y = 30,8 + 0,60x
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