t=1/30:1/30:14/30;
 s=[11.86 15.67 20.60 26.69 33.71 41.93 51.13 61.49 72.90 85.44 99.08 113.77 129.54 146.48];

T=[ones(14,1) t' (t.^2)'];
[b,bint,r,rint,stats]=regress(s',T);
b,stats