Page 28 - Math SL HB Sem 3
P. 28
\. Example:
Circumferences of heads (x)/cm 44.3 48.7 47 .5 45.0 43.1 44.2 48.0 42.6 47 .O
Heights (y)/cm 153 163 170 165 160 162 164 1 5 1 167
Using GDC, we obtain the equation of regression line:
y=1.94o3x+73.189
Scatter diagram showing heights against head circumferences
775 IIII'IIIITIIIII E
IIIIIIIIIIIIIII
IIITIIIIIIII'II
IITTIIIIIIITIII
t'70 TIIIIIIIIIINII y=7.94o3x+73.1aq
155
E
160
E Mean point.'( 45.6,167.7)
-no ffi
E
t+ l-+
155
Ft-ti-f
150
145
140
42 43 44 45 46 47 48 49 50
Head cimcumferences /cr[
r:\
{, Note:
The regression line is more accurate than the line of beslfit by eye.
+
