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Name: March 22, 2001 Score:

MATH 147

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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.