1. The analysis of historical data for Stock A and Stock B states that whenever A goes up, B goes down; and whenever A goes down, B goes up. Find out the sign of correlation coefficient between A and B?
c. either positive or negative
d. There isn't enough information to decide.
2. A visual display that shows mean, median, first and third quartiles, and +/- 1, 2, and 3
standard deviations from mean is called:
a. scatter diagram
b. box-and-whisker plot
c. stem-and-leaf display
d. dot scale diagram
3. If events A and B are mutually exclusive, as well as P(A)=0.3 and P(B)=0.5, then P(A or B)=: