Unit 4 Test

Question 1

General Additon Rule

Answer 1

P(AUB) = P(A) U P(B) - P(AnB)
Or rule
Disjoint Events

Question 2

Multiplication Rule

Answer 2

P(A) x P(BIA)
And rule
Independent Events

Question 3

How to make a Venn Diagram for probabilites involving “and” and “or”

Answer 3

And: They over lap and have a middle for and
Or: The two circles will never cross

Question 4

Law of Large Numbers

Answer 4

Law of averages does not exist

Question 5

Complement Rule

Answer 5

At Least
P(BIA)=P(AnB)/P(B)
Find the opposite of what you are looking for a subract it from 1

Question 6

Geometric Models

Answer 6

number until next sucess

Question 7

Binomial Models

Answer 7

How many successes in a certain number of trials

Question 8

Find conditional probabiliitites

Answer 8

Use the tree and multiplication rule

Question 9

Events are disjoint

Answer 9

AKA Mutually Exclusive

2 events cannot happen at the same time

Question 10

How do you determine if events are independent

Answer 10

P(AIB)=P(A)

Question 11

E(x)

Answer 11

Mulitply x by probability to find the probability of it

Question 12

How do you find expected values?

Answer 12

Sum of XP(x)

Question 13

How do you find Variance and what is it?

Answer 13

expected value of SD

(x-average)^2 x P + …

Question 14

What does P(BIA) mean?`

Answer 14

The probability of B occuring if A has already happened

Question 15

Discrete

Answer 15

you know all the outcomes

Question 16

Continuous

Answer 16

A range or limitless outcomes

Question 17

How do you find the SD with VARS?

Answer 17

Square root the VAR

Question 18

How do you add SDs?

Answer 18

SD^2 + SD^2

Question 19

Benoulli Trials

Answer 19

Only 2 outcomes, must sample less than 10%, probablity is independent of each other

Question 20

How do you find the mean and SD for geometric models?

Answer 20

Mean: 1/p
SD: squareroot failure/p^2

Question 21

How do you find mean and SD in bionomial models?

Answer 21

mean: np
SD: square root npq

Question 22

What does q mean?

Answer 22

Probability of failures

Question 23

When do you use pdf?

Answer 23

for an individual answer

Question 24

When do you use cdf?

Answer 24

Adding the numbers

Question 25

How do you do normal model?

Answer 25

Find the z score ( x-mean/ SD) and plug it into INVNORM (use binomial SD and mean)