In a 2 Age) X 2 Type of Therapy) Factorial

Multiple Choice

In a 2 age) x 2 type of therapy) factorial design, which of the following outcomes would be an example of an interaction?

A) young adults do better in therapy A; older adults also do better with this therapy
B) therapy A works better for young adults, while therapy B works better for older adults
C) therapy B works better overall, and this is true for both young and old adults
D) older adults improve more than younger adults, regardless of type of therapy