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- function lab4prob3
- natX = [20 21 22 23 24 25 26 27; 2 1 3 6 5 9 2 2];
- natY = [75 76 77 78 79 80 81 82; 3 2 2 5 8 8 1 1];
- X = [20*ones(1,2),21*ones(1,1),22*ones(1,3),23*ones(1,6),24*ones(1,5),25*ones(1,9),26*ones(1,2),27*ones(1,2)];
- Y = [75*ones(1,3),76*ones(1,2),77*ones(1,2),78*ones(1,5),79*ones(1,8),80*ones(1,8),81*ones(1,1),82*ones(1,1)];
- mean(X)
- mean(Y)
- var(X)
- var(Y)
- cov_matrix = cov(X,Y)
- r = corrcoef(X,Y)
- r(1,2);
- plot(X,Y,'b*')
- hold on;
- p = polyfit(X,Y,1)
- p(1),p(2)
- a = min(X):0.01:max(X);
- b = p(1)*a + p(2);
- plot(a,b,'r-');
- v =polyval(p, [2.5, 3])
- disp(v)
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