Question 1171705
Ho: life is >=14500
Ha: life is <14500
alpha=0.01 p{reject Ho|Ho true}
test is a z
critical value is z < 2.576
t=(13000-14500)/2100/sqrt(25)=-7500/2100=-3.57
reject Ho. The average life of the presses is < 14,500 hours
p=0.0002