Aresearcher administers an achievement test to the same group of participants on three different occasions. in reporting the results, he describes the error that occurs from repeatedly testing the same individuals. this is called:

The time sampling error

Explanation:

The time sampling error is the part of sampling error that occurred when the statistical characteristics of a population are estimated from a subset or a sample of that population. It is the sampling of collected data and information that you watch for research participants for a specific amount of time and record whether or not a particular behavior or activity took place. Kim is a psychologist and she decided to watch the data collection for two hours in a session. She broke the session into two and she describe a specific type of behavior when she observed.

"social stratification refers to the way people are ranked and ordered in society. in western societies, stratification is primarily seen and understood as a result of socioeconomic status, which produces a hierarchy in which access to resources, and possession of them, increases from the lower to the upper strata"

i would say b. research typically uses a variety of sources