50. If A and B are mutually exclusive events with P(A) = 0.5 and P(B) = 0.2, then P(A U B) =

A) 0.7 B) 0.0

C) 0.2 D)Answer not provided

51. Which statement is true?

A)The coefficient of determination from a least squares' regression line is the square root of the correlation coefficient.

B)Correlation coefficients of -0.95 and +0.95 represent relationships between two variables that have equal strength and the same direction.

C)If the coefficient of determination is 0.64, the correlation coefficient must be 0.80.

D)The correlation coefficient and the slope always have the same sign.

53. If P(A) = .40, P(B) = .30 and P (A U B) = 0.60, then A and B are

A) Dependent and disjoint (mutually exclusive)

B) Dependent and not disjoint

C) Independent and disjoint

D) Independent and not disjoint