Stats 5.3 Conditional Probability

Question 1

Conditional Probability - Event A is Get 100 on test and Event B is Study. Which event is in the denominator?

Accepted Answer

Event B

Question 2

What is the probability that Sam and Alex said yes?

Accepted Answer

.42

Question 3

Given that Sam and Alex said yes, what is the probability Sam is selected?

Accepted Answer

.71

Question 4

These events are not affected by previous events.

Accepted Answer

Independent

Question 5

∩ means

Accepted Answer

and

Question 6

In a tree diagram, what percentage do all of the "branches" add up to?

Accepted Answer

100%

Question 7

What would make an event dependent?

Accepted Answer

not influenced by whether another event occurs

Question 8

Given that you have pierced ears, what is the probability that you are female ?

Accepted Answer

84/103

Question 9

Given that you are female, what is the probability that you have pierced ears?

Accepted Answer

84/88

Question 10

What is the probability of getting heads, heads, tails?

Accepted Answer

.125

Question 11

What types of diagrams/charts can be used for conditional probability?

Accepted Answer

2 way table

Question 12

The probability that events A and B both occur can be found using the

Accepted Answer

General Multiplication Rule

Question 13

| means

Accepted Answer

given

Question 14

What is the probability that you get your allowance (60%), given that you cleaned your room (80%)?

Accepted Answer

75%

Question 15

A: prob. of 0.5 & B: prob. of 0.4. If A and B are indep., what is the prob that A and B occurs?

Accepted Answer

.2

Question 16

The probability that one event happens given another event already known to have happened...

Accepted Answer

conditional probability

Question 17

P(A ∩B) = P(A) • P(B| A)

Accepted Answer

General Multiplication Rule for Conditional Probabilities

Question 18

The multiplication rule is...

Accepted Answer

different for independent and dependent events

Question 19

What is the general multiplication rule used for?

Accepted Answer

finding the prob. of both events A and B occurring

Question 20

What is the probability of flipping heads, heads?

Accepted Answer

.25

Questions 20