The probable reason that Ebbinghaus's forgetting curves were so steep was that Ebbinghaus

a. had a poor memory.
b. learned too many lists.
c. used meaningless materials

An error in research reflecting the prospect that people who offer to participate in research studies differ systematically from people who do not is known as__________

A) volunteer bias B) random sampling C) the correlation coefficient D) an independent variable E) Select

According to Freud, your telephone number is stored at the _________ level

a. conscious c. subconscious b. preconscious d. unconscious