What was the effect of the American Revolution on slavery? A. It led most slave owners to free their slaves.
B. It caused some Americans to think about the fairness of slavery,
C. It made buying and selling slaves much more difficult.
O D. It officially outlawed slavery in some parts of the United States.

Match the item to the definition: indirect correlation, correlational research, correlational research, covary, pearson correlation coefficient, pearson correlation coefficient, direct correlation a. used to describe the relationship between two or more naturally occurring variables b. determines whether scores on the two variables covary c. whether two variables vary or change together d. denoted by the symbol "r" e. provides information about the sign (direction) and magnitude(strength) of the linear relationship. f. when the correlation is positiveg. when the correlation is negative