The Likelihood Scale

Front

What does the term 'probability' mean?

Back

Probability is a measure of how likely an event is to occur, expressed as a number between 0 (impossible) and 1 (certain).

Front

What is the likelihood scale?

Back

The likelihood scale is a way to describe the probability of events occurring, often categorized as impossible, unlikely, as likely as not, likely, very likely, and certain.

Front

What probability percentage is considered 'impossible'?

Back

0% is considered 'impossible'.

Front

What probability percentage is considered 'unlikely'?

Back

A probability percentage less than 50% but greater than 0% is considered 'unlikely'.

Front

What probability percentage is considered 'as likely as not'?

Back

50% is considered 'as likely as not'.

Front

What probability percentage is considered 'likely'?

Back

A probability percentage greater than 50% but less than 100% is considered 'likely'.

Front

What probability percentage is considered 'very likely'?

Back

A probability percentage close to 100%, typically 90% or higher, is considered 'very likely'.

Front

What probability percentage is considered 'certain'?

Back

100% is considered 'certain'.

Front

If the probability of an event is 0.01, how is it described on the likelihood scale?

Back

It is described as 'almost impossible'.

Front

What is the likelihood of flipping a coin and landing on heads?

Back

The likelihood is 'as likely as not' (50%).