In language, phonemes are to as morphemes are to

________ refers to the ability of an instrument or tool to accurately measure what it is supposed to measure.

A. generalizability B. operational definition C. reliability D. validity

The strange situation paradigm is often used to assess the attachment of one- to two-year-old children to their mothers. The mother and child enter a room that is equipped with a two-way mirror. Then, a stranger walks into the room

Following this the mother leaves her child with the stranger. Lastly, the mother returns to the room. Throughout the procedure, a researcher observes and records the interactions between the mother and child. This is an example of a ___________ study. a. field c. ethnographic b. laboratory d. ground