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 Reaction Time (s) (C3). In By variables enter Age Stimulus (C1 C2).
Click in Statistics. Select Standard deviation. Click Ok.
Click Ok.
Lowest standard deviation: 0.1034
Highest standard deviation: 0.1930
But, $0.1930\lt2\times0.1034$
