Question 1089636
The 95% interval is mean +/- t df=29, 0.975, *12/sqrt(30)
since t*s/sqrt(n) is the interval width.
t is 2.045
interval is +/-2.045*12/sqrt (30)=4.48
(124.52, 133.48) is the interval in units mm Hg.  
Since the interval does not contain mu, one would conclude that it significantly lowers systolic BP.  The upper value is less than the original mean that is being tested against, and we are highly confident that the true value lies within this interval.