Which of the following is not part of the federal bureaucracy?

Any procedure that requires measurement over a fairly long period of time is particularly vulnerable to confounding by

A) entropy B) selection ratio C) geography D) history.

History is a potential confounding factor in the interrupted time-series design because

A) the time-series design takes a fairly long period of time. B) all of the participants are exposed to the same conditions. C) the participants are all considered one group despite individual differences in experience. D) the momentum of multiple measures is disrupted by the manipulation.