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 Birth Weight (g) (C3). In By variables enter Age Diet (C1 C2).
Click in Statistics. Select Standard deviation. Click Ok.
Click Ok.
Lowest standard deviation: 421
Highest standard deviation: 228
But, $421\lt2\times288$
