Answer
P-value $=0.0003\ltα$. Reject the null hypothesis.
There is enough evidence to conclude that there is a difference in wait times at each restaurant’s drive-through.
Work Step by Step
$H_0:~µ_1=µ_2$ versus $H_1:~µ_1\ne µ_2$
In MINITAB, enter the McDonald’s values in C1 and the Wendy’s values in C2.
Select Stat -> Basic Statistics -> 2-Sample t
Select "Each sample is in its own column"
In Sample 1 enter C1 and in Sample 2 enter C2
Click in Options. Enter 90 in Confidence level, 0 in Hypothesized difference. In "Alternative hypothesis" select "Difference $\ne$ hypothesized difference". Click OK.
Click OK.
