Question 1159396
Ho: d<=20,000 km/yr
Ha: d>20,000 km/year
alpha=0.05 P{reject Ho|Ho true}
test statistic is a t(0..95) df=99
Critical value t>1.66
calculation t=(x bar-mean)/s/sqrt (100)
t=3500*10/3900
t=8.97
strongly reject Ho and conclude that the vehicles are driven more than 20,000 km/year
P<0.0001 (about 10^(-15))