Probability

Question 1

What is an outcome

Answer 1

The result of a trial

Question 2

What is an event

Answer 2

A particular result which may contain one or more outcome

Question 3

How can you express probability

Answer 3

-Decimals
-Fractions
-Percentages

Question 4

What’s the formula of expected probability of event A

Answer 4

P(A) * number of trials

Question 5

What’s the formula for the probability of an event

Answer 5

number of successful outcomes / total number of possible outcomes

Question 6

What’s the formula for estimated probability

Answer 6

number of trials with successful outcomes / total number of trials

Question 7

How can you test for bias

Answer 7

Compare predicted results with results from an experiment

Question 8

What’s the formula for risk of event

Answer 8

number of trials in which event happens / total number of trials

Question 9

What does a sample space show

Answer 9

A list id all the possible outcomes of a trial

Question 10

What does a venn diagram show

Answer 10

A way of showing how items are split between two sets

Question 11

What must the probability represented in a venn diagram add up to

Answer 11

1

Question 12

What does mutually exclusive mean

Answer 12

Mutually exclusive events cannot occur at the same time

Question 13

What’s the formula for the probability that event A does not happen

Answer 13

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

Question 14

What’s the formula for mutually exclusive events

Answer 14

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

Question 15

What does P(A and B) mean

Answer 15

The probability that both A and B happen (the middle of a venn diagram)

Question 16

What does P(A or B) mean

Answer 16

The probability that either A or B happens (the whole of the venn diagram, including the centre part)

Question 17

What is the addition law for events that are not mutually exclusive

Answer 17

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

Question 18

What does independent event mean

Answer 18

That the outcome of one event does not affect the outcome of another

Question 19

What’s the formula for the P(A and B) when both events are independent

Answer 19

P(A) * P(B)

Question 20

What does P(A|B) mean

Answer 20

The probability of event A occurring given that B has already occured.

Question 21

What’s the formula for the probability of A and B both occurring

Answer 21

P(A|B) * P(B)

Question 22

What’s the formula for the probability of B given A is

Answer 22

P(A and B) / P(A)