# Psychology Dictionary of Arguments

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Probability: Probability is a measure of how likely an event is to occur. It is expressed as a number between 0 and 1, where 0 represents impossibility and 1 represents certainty. See also Knowledge, Certainty, Likelihood, Chance, Probability theory, Probability distribution, Probability functions.
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Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments.

Author Concept Summary/Quotes Sources

Richard Feynman on Probability - Dictionary of Arguments

I 86
Def Probability//Feynman: of a particular result of an observation: our estimate of the most probable fraction of a number of repeated observations giving the particular result.
I 87
P(A) = NA/N.

(s) NA: desired N: all

Probability/Feynman: absurd: e.g. what is the probability of a ghost in this house? There is no repetition here.
N and NA are not numbers based on actual observations.
NA is our best guess of what would happen.
>Subjective probability
, >Chance, >Conditional probability, cf. >Bayesianism, >Relative frequency.
I.e. probability is dependent on our knowledge and common sense.
Probabilities change as our knowledge changes.

I 551
Probability/Feynman: of course, there is no probability that gas atoms will go in a certain direction, because a certain direction is too exact. Therefore, we must speak of a standard "size":
As many molecules pass through any surface as through any other surface of equal size on the sphere.
>Measurements, >Method, >Generalization, >Idealization.

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Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution. Translations: Dictionary of Arguments
The note [Concept/Author], [Author1]Vs[Author2] or [Author]Vs[term] resp. "problem:"/"solution:", "old:"/"new:" and "thesis:" is an addition from the Dictionary of Arguments. If a German edition is specified, the page numbers refer to this edition.

Feynman I
Richard Feynman
The Feynman Lectures on Physics. Vol. I, Mainly Mechanics, Radiation, and Heat, California Institute of Technology 1963
German Edition:
Vorlesungen über Physik I München 2001

Feynman II
R. Feynman
The Character of Physical Law, Cambridge, MA/London 1967
German Edition:
Vom Wesen physikalischer Gesetze München 1993

> Counter arguments against Feynman
> Counter arguments in relation to Probability