Topic 5 (statistics)

Question 1

probability

Answer 1

-likelihood/chance of something happening in the future

Question 2

experiment

Answer 2

repeatable process that gives rise to a number of outcomes

Question 3

event

Answer 3

collection or set of one or more outcomes

Question 4

sample space

Answer 4

set of all possible outcomes of an experiment

Question 5

event and sample space denoted by

Answer 5

capital letters

Question 6

discrete random variable

Answer 6

discrete: specific values you can count
random: no bias, equal chance as its chosen randomly
variable: a value that can change

Question 7

venn diagrams

Answer 7

help solve probability problems 
rectangle = represent sample space 
circles= repent the events 
-change direction of shading 
-intersect = double shading

Question 8

AnB

Answer 8

a intersects b
double shaded
probability both a and b happening

Question 9

AuB

Answer 9

union = all shaded regions

probability of A or B or both

Question 10

A’

Answer 10

probability not A

Question 11

two events are mutually exclusive if

Answer 11

they have no outcomes in common

P(AuB)= P(A) +P(B)

Question 12

two events are independent if

Answer 12

one event have no effect on the other
-can have common outcomes
P(AnB) = P(A) x P(B)