Answer
P-value $\gtα$. Do not reject the null hypothesis.
There is not enough evidence to conclude that Thrifty is less expensive than Hertz.
Work Step by Step
$H_0:~µ_d=Thrifty-Hertz=0$ versus $H_1:~µ_d=Thrifty-Hertz\lt0$
In MINITAB, enter the Thrifty in C1 and the Hertz in C2.
Select Stat -> Basic Statistics -> Paired-t
Select "Each sample is in a column". In "Sample 1" enter C1 and in "Sample 2" enter C2
Click Options. In confidence level enter 90. In Hypothesized difference enter 0. In Alternative hypothesis select difference < hypothesized difference. Click OK.
Click OK.
