Adoption and twin studies suggest that schizophrenia is a(n) ________ trait

Weakening a behavior through the withdrawal of reinforcement for that behavior is known as ______.

Fill in the blank(s) with the appropriate word(s).

What might be the result of a researcher's discovery that the subjects who dropped

out of his/her experiment are random samples, and thus do not constitute a special subgroup? A) The researcher might have to repeat the experiment B) The researcher may have to drop out another random segment C) The researcher could be fairly sure that the results are due to subject differences D) The researcher could be fairly sure that the results are not due to subject differences