In a study, the subjects do not know to which group they are assigned, but the researchers are aware of the subjects’ group assignments.

a. double-blind
b. placebo
c. single-blind
d. control

Item 14 which statement is an accurate description of the transatlantic slave trade? africans were brought to the americas in a three-part system of triangular trade. slaves went from europe to africa, and then to the americas in a circle of trade. native american slaves were sent to europe in exchange for sugar and molasses. africans traded tobacco and furs for captured arabs whom they sold into slavery.

Why did poland, hungary, and east germany join the warsaw pact? a)their people voted to join in free elections. b)their efforts to join nato failed. c)they wanted to stop the spread of communism in europe. d)they were soviet satellites that had little choice.

Why were the bay of pigs invasion and cuban missle crisis even major events in the kennedy presidency