The members of a population have been numbered 1-1000. A sample of size 20 is to be taken from the population, using stratified random sampling with proportional allocation. The strata are of sizes 300, 200, 400, and 100, where stratum #1 consists of the members of the population numbered 1-300, stratum #2 consists of the members of the population numbered 301-500, and so forth.
Determine the sample sizes that will be taken from the strata.