Question 1195184
d=difference from 0 with-without
Ho: d=0 no change
Ha: change
alpha =0.10 p{reject Ho|Ho true}
test is a 1 sample two-way t-test
critical value reject t if |t|>1.397
difference is 0.3,0.6,0,0,-0.3,0.3,0.2,0.3,0.6,0.4
mean is 0.2667
s=0.283
t=(0.2667)/0.283/sqrt(9)
=2.83

reject Ho: there is a change in mileage.p-value=0.022
Absolutely use the same drivers in the conditions, unless one can prove that there is no interaction. How one drives makes a big difference in mileage.