Aresearcher would like to study the average amount of debt owed by retired people in the united states. what could be an example of a strata sampled? select all that would apply.
retirees from different states in the united states
retirees who had different jobs in the united states
retirees with different education levels
retirees who lived near the researcher
retirees who returned a survey sent in the mail

Retirees who had different jobs and different income levels.

In stratified sampling, the population is broken up into groups ("strata") that are distinctly different from each other.

muslims control the north africa during the period of 1500 up

to 1800. they made a barrier to prevent further european exploration from

entering the africa from the north. however, the dutch ware still able to move

toward the interior with having south africa as one of the routes leading to

the east for trading with asia.