When might a researcher prefer to use a weighted sampling method? ?

This method could be used when there is a smaller percentage of a group answering a survey than there is in the actual population.

During the paleolithic, hominins grouped together in small societies such as bands, and subsisted by gathering  plants  and fishing, hunting or scavenging wild  animals. the paleolithic is characterized by the use of knapped stone tools, although at the time humans also used  wood  and bone tools.