Question

6. Start with the three points (a) Find the least squares line through the points. (b) Find the best curve of the form. I, C + D2r through the points. (c) Sketch the points, the least squares line, and the curve you found in part graph. Which gives a better fit, the line or the curve? (b) on the same

Answer 1

b = Σ8-.mp.. 3X5 3 y=-10附知り the time 3x1 2 2 4

D F 21. 22+12+2 -13o 「3 규 42 구의 구2] 구3 ㄧ厂21-2]厂30 132 2. (e) Fon line 20 tim)守(S2-20 Evan 보 eten
Matlab Code

x=-5:0.1:5;
y=-10*x+20;
plot(x,y,'r')
hold on
x=-5:0.1:5;
y=24-6*2.^x;
plot(x,y,'b')
plot(0,22,'g*',1,6,'m*',2,2,'k*')

Output

100 50 -50 -100 -150 200 -5 4 -3 -2 0 13 45 4