Samson is a seven-year-old boy. He always gets poor grades in school. His language teacher complains that he does not remember anything that she teaches and he speaks in an incoherent manner. If Samson's condition is caused by brain damage, which part of the brain is his physician most likely to check first?

A family in which at least one of the adults has a child from a previous relationship is a _____________

Fill in the blanks with correct word

A series of observations before treatment allows a researcher to determine whether ____

a. the treatment has a temporary effect b. the treatment has a permanent effect c. scores are influenced by assignment bias d. scores are influenced by some factor unrelated to the treatment