-->// Problem 2
-->data = [1 0; 2 1; 4 2; 5 3]
 data  =
    1.    0.  
    2.    1.  
    4.    2.  
    5.    3.  
-->y = data(:,2)
 y  =
    0.  
    1.  
    2.  
    3.  
-->X=[ones(data(:,1)) data(:,1)]
 X  =
    1.    1.  
    1.    2.  
    1.    4.  
    1.    5.  
-->ATA = X'*X
 ATA  =
    4.     12.  
    12.    46.  
-->ATy = X'*y
 ATy  =
    6.   
    25.  
-->betas = ATA \ ATy
 betas  =
  - 0.6  
    0.7  
-->// y = -0.6 + 0.7*x is the answer
 
-->//Problem #12
-->data = [44 91; 61 98; 81 103; 113 110; 131 112]
 data  =
    44.     91.   
    61.     98.   
    81.     103.  
    113.    110.  
    131.    112.  
-->y=data(:,2)
 y  =
    91.   
    98.   
    103.  
    110.  
    112.  
-->X=[ones(data(:,1)) log(data(:,1))]
 X  =
    1.    3.7841896  
    1.    4.1108739  
    1.    4.3944492  
    1.    4.7273878  
    1.    4.8751973  
-->ATA = X'*X
 ATA  =
    5.           21.892098  
    21.892098    96.646303  
-->ATy = X'*y
 ATy  =
    514.       
    2265.8899  
-->betas = ATA \ ATy
 betas  =
    17.92434   
    19.384999  
-->// answer is y = 17.92434 + 19.384999*ln(w)
-->BloodPressure100Pounds = betas(1)+betas(2)*log(100)
 BloodPressure100Pounds =
    107.19556