Stats GCSE Probability

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Number of successful outcomes/total number of possible outcomes

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29 Terms

1

Number of successful outcomes/total number of possible outcomes

How to calculate P(event)

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2

Something that can happen as a result of a trial

What’s an outcome?

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3

The number of times you expect an event to happen

What’s the expected frequency?

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4

P(outcome)*number of trials

How to calculate expected frequency

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5

no. of trials with success/total no. of trials

How to calculate estimated probability

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6

Number of trials

What increases the reliability of estimated probability?

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7

Relative frequency

What’s another way to say estimated probability?

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8

The probability of an event occurring for negative events

What’s the risk?

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9

No. of trials where event happens/total no. of trials

How to calculate risk of event

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10

How likely an event is to happen

What’s the absolute risk?

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11

How much more likely an event is to happen for one group compared to another group

What is relative risk?

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12

Risk for those in the group/risk for those not in the group

How to calculate relative risk

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13

Events that cannot happen at the same time

What are mutually exclusive events?

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14

The set contains all the possible outcomes

What does exhaustive mean?

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15

1

In mutually exclusive and exhaustive events, what’s the sum of the probabilities?

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16

P(A or B)=P(A)+P(B)

P(A)+P(not A)=1

P(not A)=1-P(A)

What is the addition law for ME events?

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17

Mutually exclusive events

What doesn’t the general addition law not apply for?

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18

P(A or B)=P(A)+P(B)-P(A and B)

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19

The intersect

How is P(A and B) represented on a Venn diagram?

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20

Everything in both circles

How is P(A or B) represented on a Venn diagram?

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21

Unconnected events

What are independent events?

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22

P(A and B)=P(A)*P(B)

What’s the rule for 2 independent events?

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23

P(A and B and C)=P(A)**P(B)**P(C)

What’s the rule for 3 independent events?

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24

When one event affects the other

What’s conditional probability?

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25

The probability of B given that A happened

What does P(B|A) mean?

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26

If phrases like ‘given that’ or ‘if’ are used

How can you tell if something’s conditional probability?

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27

P(A and B)/P(B)

How to calculate P(B|A)

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28

P(B|A)*P(A)

How to calculate P(A and B)

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29

The events are conditional, not independent

What does if mean if P(A) isn’t equal to P(A|B)?

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