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//Example 5.2
clc
clear
x = [20 30 35 40 45 50];
y = [10 11 11.8 12.4 13.5 14.4];
X = x.^2;
Y = y;
n = length(Y);
M1 = [sum(Y); sum(X.*Y)];
M2 = [n sum(X); sum(X) sum(X.^2)];
A = M2\M1;
a = A(1);
b = A(2);
disp(round(a*10^4)/10^4, "a =")
disp(round(b*10^4)/10^4, "b =")
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