Name: March 22, 2001 Score:

MATH 147


Quiz 7





(6 pts.)

Problem 1. A ticket is drawn from the box shown.

(B=Blue, R=Red, G=Green.)



a. What is the probability of drawing a blue ticket given that the ticket has a 3 on it?









b. Are color and number independent?











(2 pts.)

Problem 2. If we know that event A and event B are dependent, we can say with certainty that,



a. event A and event B cannot both occur.



b. the probability of B occurring given that A has occurred is greater than the probability of B occurring.



c. the probability of A and B occurring is the probability that A occurs times the probability that B occurs given that A has occurred.



d. both (b) and (c).



e. none of the above.







(2 pts.)

Problem 3. When we use the method of vertical strips to estimate percentages about a sub-population we should

remember,



a. the spread within the vertical strips of the scatter diagram should be similar.



b. the new average is a point directly on the regression line.



c. the pattern of the scatter diagram should be homoscedastic.



d. both (a) and (b).



e. all of the above.