"In survey research, is typically used to ensure that a sample is representative, whereas in experiments, is used to balance differences between subjects across the various experimental groups."

Random sampling ; Random assignment

Explanation: In choosing subjects or samples to be used in a research study, involving the entire population in the study might seem unrealistic or virtually impossible, Therefore the need to select samples from the population which will be representative of the entire population, giving all samples an equal chance of being selected becomes imperative, such sampling method is generally called random sampling.

On the other hand, when assigning subjects or participants into experimental groups, eliminating bias which could result from manual assignment of subjects into the various groups is required. Random assignment technique ensures that variation in the subjects associated with the various experimental groups is stabilized.

answer; archaeologists;

answer; a team- maintenance role;