Chapter p

Question 1

How do you determine if something is independent?

Answer 1

For events to be independent P(S and T) = P(S) x P(T)

Something is independent if knowing A has occurred doesn’t change the probability of B occurring

Question 2

How do you determine P(A if B)?

Answer 2

P (A and B) / P(B)

Question 3

How do you determine P(B if A)?

Answer 3

P (B and A) / P(A)

Question 4

How do you find P(not B)?

Answer 4

You take 1 minus the P(B)

Question 5

How do you determine if two events are disjoint / mutually exclusive?

Answer 5

If the two events can occur at the same time, they are NOT disjoint or mutually exclusive.

Question 6

If A and B are independent events, what is P(A if B)

Answer 6

Simply P(A)

Since B cannot happen at the same time as A

Question 7

How do you determine the P (A and B) if A and B are independent events?

Answer 7

Multiply them together.

Question 8

How to do you determine the P(B) in a two-way table?

Answer 8

Sum up the values in the B row.

Question 9

How do you determine P(A and B) in a two way table?

Answer 9

Find the cell that satisfies A and B and use that value

Question 10

If A and B are disjoint, what is P(A or B)?

Answer 10

P(A) + P(B)

Question 11

If A and B are not disjoint what is P(A or B)?

Answer 11

P(A) + P(B) minus P(A and B)