Question 1181769
Ho: mu is >=40 minutes
Ha: mu is < 40 minutes
alpha=0.05 p{reject Ho|Ho true}
test statistic is a t (0.975, f=15) 1 way test. Reject Ho if t < -1.753
t=(30-40)/10/sqrt(16)
=-10*4/10
=-4
reject Ho and conclude that the new system is faster than the old one, p-value 0.0006