The case of Samuel George Morton is strong evidence that:
a. randomized sampling is important.
b. a scientist can subtly influence the outcome of an experiment.
c. placebo effects cannot be controlled.
d. the performance of participants can be influenced by the experimenter's nonverbal communication.
Question 2
Psychologists report that if a single recording error is made by an experimenter, it is usually:
a. an error that would lead to the failure to reject the null hypothesis.
b. in support of the experimental hypothesis.
c. due to fraud.
d. due to the personal equation.
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