Proportional allocation was used in the stratified sample in Example 3.2. It was noted, however, that variability

Question:

Proportional allocation was used in the stratified sample in Example 3.2. It was noted, however, that variability was much higher in the West than in the other regions. Using the estimated variances in Example 3.2, and assuming that the sampling costs are the same in each stratum, find an optimal allocation for a stratified sample of size 300.
In Example 3.2