Author Question: A difference that is produced only by an expectation of an effect A) is impossible in ... (Read 7 times)

future617RT · **on:** Aug 4, 2018

A difference that is produced only by an expectation of an effect

A) is impossible in experimental designs.
B) is a placebo effect.
C) is routine in experimental designs.
D) cannot be controlled, but it is rarely a significant problem.

Question 2

In a single-group, posttest-only study, an observed difference

A) cannot be a placebo effect.
B) might be a placebo effect.
C) is strong evidence for a causal relationship.
D) is almost always going to be statistically significant.