This is for ap psychology. random sampling is random assignment is

Random sampling applies to the process you use to choose people from the population to cooperate in your study. This type of sampling is done in order to ensure the external validity of the sample.

Random assignment applies to the process you use to place members into groups in an exploratory study. It is the significant part of a “true” experiment because it helps assure that any discrepancies found within the groups are attributed to the treatment preferably than a confounding variable.

european feudalism was a combination of legal and military customs in medieval europe that flourished between the 9th and 15th centuries. broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour.

japanese feudalism. the era of feudalism in japan took place from the 12th through 19th centuries. during that period local rulers, either powerful families or military warlords, dominated the land, while the emperor was merely a figurehead and not a significant political presence.