A __________ procedure in an experimental investigation ensures that neither the researcher nor the subjects will know about what conditions are being administered to the participants

Suppose you were a participant in David Rosenhan's research. What is the likely outcome when you went to a mental hospital and complained of hearing voices?

a) You would be sent home immediately. b) You would be arrested for impersonating a patient. c) You would be diagnosed as suicidal and admitted for treatment. d) You would be diagnosed as suffering from schizophrenia and admitted.

The breeding of racehorses for speed is an example of

(a) natural selection (b) artificial selection (c) correlation (d) the effect of the lack of variation in evolutionary biology