An impossible event, with probability 0.
Two events are equally unlikely if the probability that they do not happen is the same for each event. And, since the probability of an event happening and not happening must add to 1, equally unlikely events are also equally likely,
In common usage, unlikely means a low probability of occurrence. But as a term in mathematics, an unlikely event is not rigorously defined as a "low number" is subjective. Certainly, in a comparative sense, i.e. event A is less likely to occur than event B, we can state that the probability of occurrence of A is less than B.
100% likely means it is certain to occur.
If your chi square test has a probability of 0.05 or less it is likely, but not certain, that your hypothesis is not correct.
My answer for probability Probability is the chance that something will happen - how likely it is that some event will happen. Sometimes you can measure a probability with a number: "10% chance of rain", or you can use words such as impossible, unlikely, possible, even chance, likely and certain. Example: "It is unlikely to rain tomorrow".
in maths you can have lots but it is usually the following: impossible very unlikely unlikely 50/50 likely very likely certain
An impossible event, with probability 0.
this is probability 0 means impossible and 1 means certain
Likely refers to a high probability or a strong chance of something happening, while unlikely refers to a low probability or a slim chance of something happening. In other words, likely means it is probable or expected to occur, whereas unlikely means it is improbable or not expected to occur.
It is a probability of between 0.3 and 0.7
Two events are equally unlikely if the probability that they do not happen is the same for each event. And, since the probability of an event happening and not happening must add to 1, equally unlikely events are also equally likely,
Probability is the likelihood of something happening. It is the extent to which something is likely or unlikely to occur.
In common usage, unlikely means a low probability of occurrence. But as a term in mathematics, an unlikely event is not rigorously defined as a "low number" is subjective. Certainly, in a comparative sense, i.e. event A is less likely to occur than event B, we can state that the probability of occurrence of A is less than B.
Level of probability of an adverse event occurring
100% likely means it is certain to occur.
The likelihood that something will happen refers to the probability or chance of that event occurring. It is often quantified on a scale from 0 (impossible) to 1 (certain). The higher the likelihood, the greater the probability of the event occurring.