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Question 1

what does it take to be a “OR event: AuB”

Answer 1

the outcome must be in A or in B or is in both A and B.

but outcomes are not counted more than once

Question 2

what does it take to be a “ AND event: AnB”

Answer 2

the outcome must be in A and B at the same time

Question 3

How do complements of an event work

Answer 3

it is denoted A′ (read “A prime”). A′ consists of all outcomes that are NOT in A.

P(A)+P(A’) =1 always

Question 4

what is A union B

Answer 4

A or B

Question 5

what is A Intersection B

Answer 5

A and B

Question 6

How does conditional probability work [A given B: P(AIB)]

Answer 6

it is the probability that event A will occur given that the event B has already occurred.

A conditional reduces the sample space

Question 7

what is the difference between a sample with replacement and one without replacement

Answer 7

with: the knowledge that one occurred does not affect the chance the other occurs.

considered to be independent,

without: the 2nd pick is affected by the result of the 1st

considered to be dependent or not independent.

Question 8

what is a mutually exclusive event

Answer 8

when A AND B do not share any outcomes