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.