Answer
The population variances can be considered the same.
Work Step by Step
In MINITAB, enter the Highly Selective values in C1, the Selective values in C2, the Nonselective values in C3, the Open-door values in C4 and in C5 enter the Not Rated values.
Select Stat -> Basic Statistics -> Display Descriptive Statistics
In Variables enter C1 C2 C3 C4 C5
Click in "Statistics". Select Standard Deviation and Variance. Click OK.
Click Ok.
The largest sample standard deviation: 1.099
The smallest sample standard deviation: 0.554
$1.099\lt2\times0.554$
