Answer
The requirement of equal population variances for each treatment is verified.
Work Step by Step
In MINITAB 18, enter the data according to the table below.
Select Stat -> Basic Statistics -> Display Descriptive Statistics
In Variables enter Prices (C3). In By variables enter 'Service Center' Location (C1 C2).
Click in Statistics. Select Standard deviation. Click Ok.
Click Ok.
Lowest standard deviation: 2.50
Highest standard deviation: 4.00
But, $4.00\lt2\times2.50$
