Answer
The requirements are satisfied.
Work Step by Step
1 - It is a simple random sample
2 - The samples are independent
3 - The sample was obtained from populations normally distributed.
4 - The variances are about the same: $198.6\lt2\times128.3$
In MINITAB, enter the Large Family Cars values in C1, the Passenger Vans values in C2 and in C3 enter the Midsize Utility Vehicles values.
Select Stat -> Basic Statistics -> Display Descriptive Statistics
In Variables enter C1 C2 C3
Click in Statistics. Select standard deviation. Click OK.
Click Ok.
