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Nov 18th, 2019
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  1. function lab4prob3
  2. natX = [20 21 22 23 24 25 26 27; 2 1 3 6 5 9 2 2];
  3. natY = [75 76 77 78 79 80 81 82; 3 2 2 5 8 8 1 1];
  4.  
  5. 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)];
  6. 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)];
  7.  
  8. mean(X)
  9. mean(Y)
  10.  
  11. var(X)
  12. var(Y)
  13.  
  14. cov_matrix = cov(X,Y)
  15.  
  16. r = corrcoef(X,Y)
  17. r(1,2);
  18. plot(X,Y,'b*')
  19. hold on;
  20. p = polyfit(X,Y,1)
  21. p(1),p(2)
  22. a = min(X):0.01:max(X);
  23. b = p(1)*a + p(2);
  24. plot(a,b,'r-');
  25.  
  26. v =polyval(p, [2.5, 3])
  27. disp(v)
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