The system that "filters" blood before it enters the brain is called the __________

Which of the following is a common ethical concern raised about the Milgram study?

a. Participants' compensation was low. b. Participants were forced to learn unpleasant things about themselves without agreeing to that ahead of time. c. Participants were never given the chance to serve in the role of learner. d. Participants had to receive a sample shock of 75 volts before the study began.

In observational research, a behavior of interest might occur only intermittently. If an investigator wanted to estimate the frequency of the behavior by taking a snapshot at random times, the approach would involve

a. time-point sampling. b. cluster sampling. c. continuous real-time sampling. d. time-interval sampling.