Answer
P-value $0.129\gtα=0.05$. Do not reject the null hypothesis.
There is not enough evidence to conclude that the new loading/unloading procedure is effective in reducing wait time.
Work Step by Step
$H_0:~µ_d=before-after=0$ versus $H_1:~µ_d=before-after\gt0$
In MINITAB, enter the Wait time before in C1 and the Wait time after 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 95. In Hypothesized difference enter 0. In Alternative hypothesis select difference > hypothesized difference. Click OK.
Click OK.
