Probability

Question 1

What is an experiment?

Answer 1

A process that produces observations

Question 2

What is a trial?

Answer 2

A single repetition of an experiment

Question 3

What is a sample space?

Answer 3

All possible outcomes for an experiment

Question 4

What is an event?

Answer 4

A possible outcome stated in terms of members of the sample space.

Question 5

Counting rule:

Answer 5

Number of outcomes = n1 x n2 n3 x……..

Question 6

What does ! mean

Answer 6

Factorial.

Question 7

Excel Functions for factorial eg 3 people from 10 volunteers.

Answer 7

FACT (3) X FACT (7)

OR

COMBIN(10,3)

Question 8

Permuatations in excel
E.G 8 athletes, 3 podium spots

Answer 8

=PERMUT(8,3)

Question 9

3 ways of measuring probability:

Answer 9

– Exact probability
– Relative frequency
– Subjective assessment

Question 10

What is exact probability?

Answer 10

All outcomes have the same chance of happening

Question 11

What is relative frequency?

Answer 11

Observe repeated trials of an experiment. The relative frequency
(proportion) estimates the probability

Question 12

What is subjective assessment?

Answer 12

Personal measure of uncertainty. Usedirect information, personal judgement and experience to give subjective assessment.