Slide 2 Probability Terminology Events are the number of possible outcome of a phenomenon such as the roll of a die or a fillip of a coin trials are a coin flip or die roll Slide ID: 708259 Download Presentation

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Slide . 2. Probability - Terminology. Events are the . number. of possible outcome of a phenomenon such as the roll of a die or a fillip of a coin.. “trials” are a coin flip or die roll. Slide .

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Slide1

Slide 1

Probability

Probability theory underlies the statistical hypothesis.Slide2

Slide 2

Probability - Terminology

Events are the

number

of possible outcome of a phenomenon such as the roll of a die or a fillip of a coin.

“trials” are a coin flip or die rollSlide3

Slide 3

Probability – total number of outcomes

We are interested in the probability of something happening relative to the total number of possible outcomes.

Consider tossing a coin together with throwing a die.

Two possible outcomes of the coin flip

Six possible outcomes of the die tossSlide4

Slide 4

Probability - total number of outcomes

Two possible outcomes of the coin flip

Six possible outcomes of the die toss

Without regard for order, what are the total number of outcomes of the two events together?

H1, H2, H3 …Slide5

Slide 5

Probability - total number of outcomes

Number of events for each trial

k

1

= 2, k

2

= 6

So, in general:

The number of events = k1 x k1 x k3 x …

knSlide6

Probability

Most probability exercises focus on set notation.Simple understanding creates the foundation for advanced topics.Slide7

Venn Diagram

In any experiment there is a set of possible outcomes “outcome set”Slide8

Venn Diagram

Intersect – the common elements in two setsSlide9

Venn Diagram

Mutually exclusive - sets with no elements in common, null intersectSlide10

Venn Diagram

Union – the combination of elements in two sets.Slide11

Venn Diagram

Complement – the remainder of outcomes in a set that are not in a subsetEx: if a set is defined as “even numbered die rolls” the complement are those rolls that are “odd numbered”Slide12

Probability of an event

Define the relative frequency:N is the total number of eventsf is the number of times that outcomes in the subset were observed.Slide13

Some notation:

Note on notation:Trial1 the subscript is for the trial

P(Trial

1

= 1) = 1/6

P(Trial

1

= “H”) = 0.5

So if we have three trials:

P(Trial

1

= “H”), P(Trial

2

= “H”), P(Trial

3

= “T”)Slide14

Mutually exclusive events

If two events are mutually exclusive “A” and “B” then the probability of either event is the sum of the probabilities:P(A or B) = P(A) + P(B)P(“HRC win” or “DJT win”) =

P(“HRC win”) + “DJT win”

These are disjoint sets – both outcomes cannot be realized.Slide15

Non-mutually exclusive events

If events are not mutually exclusive:i.e.. both outcomes can be realizedSets “Mammals” and “flying vertebrates” are not disjoint.

P(A or B) = P(A) + P(B) – P(A and B)Slide16

Example 1

Probability of non-mutually exclusive eventsP(A or B) = P(A) + P(B) – P(A and B)

Using a single die:

P(“odd number” or “number < 4”)Slide17

Example 1

Probability of non-mutually exclusive eventsP(A or B) = P(A) + P(B) – P(A and B)

Using a single die:

P(“odd number” or “number < 4”)

P(“odd number”) = P(1) + P(3) + P(5) = ½

P(“number < 4”) = P(1) + P(2) + P(3) = ½

P(“odd number” and “number < 4”) = P(1) + P(3) = 1/3Slide18

Probability of Events

Mutually exclusive:P(A or B) = P(A) + P(B)

Non-mutually exclusive:

P(A or B) = P(A) + P(B) – P(A and B)Slide19

Example 2

Deck of cards13 in each suit (4 suits)P(“Diamond”) = P(“King”) = P(“Diamond” or “King”) = Slide20

Example 2P(A or B) = P(A) + P(B) – P(A and B)

Deck of cards13 in each suit (4 suits)Cards in each suit: 2 to 10, J, Q, K, A

P(“Diamond”) =

P(“King”) =

P(“Diamond” or “King”) = Slide21

P(A or B or C) =

P(A)

+

P(B)

+

P(C)

–

P(A and B) –

P(A and C) –

P(B and C) +

P(A and B and C)

Non-mutually exclusive eventsSlide22

P(A or B or C) =

P(A) +

P(B) +

P(C) –

P(A and B)

–

P(A and C)

–

P(B and C)

+

P(A and B and C)

Non-mutually exclusive eventsSlide23

P(A or B or C) =

P(A) +

P(B) +

P(C) –

P(A and B) –

P(A and C) –

P(B and C) +

P(A and B and C)

Non-mutually exclusive eventsSlide24

Intersecting Probabilities

If two or more events intersect the probability associated with that intersection is the probabilities of the individual events.P(A an B) = P(A) * P(B) P(A an B and C) = P(A) * P(B) * P(C)Slide25

Conditional Probability

Probability of one event with the stipulation that another event also occurs.Ex. Probability of selecting a “queen” givent

that the card is a “spade”

We know we have a spade…

P(Event A, given event B) = P(A and B,

jointly

)/P(B)

P(queen | spade) = P(queen of spades) / P(spade)Slide26

Conditional Probability, cont’d

P(Event A, given event B) = P(A and B, jointly)/P(B)

P(queen | spade) = P(queen of spades) / P(spade)

P(queen | spade) = frequency of queen of spades/

frequency of spades

Note that this conditional probability is quite different from the probability of selecting a spade, given that the card is a queen…

P(spade | queen) =

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