It is true that scientific models are based on a set of observations, along with a logical analysis of those observations.
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A theory is a set of ideas or principles that explain a set of related observations through logical reasoning and empirical evidence. Theories help to organize information, predict outcomes, and guide further research in a particular field of study.
A scientific theory that can account for and predict a wide variety of phenomena across different disciplines is considered a unifying explanation. It provides a comprehensive framework that ties diverse observations together under one set of principles or laws.
Such a system is called a theory. For example, Darwin's Theory of Evolution, or Newton's Theory of Universal Gravitation, or Einstein's Theory of Relativity.
It is true that scientific models are based on a set of observations, along with a logical analysis of those observations.
A scientific theory is a set of commonly accepted scientific ideas and assumptions that explain a wide range of observations and have been rigorously tested. These theories are supported by evidence and have withstood repeated experiments and observations.
The "mean" is the "average". In statistics, it is the commonly used terminology. The mean value of a set of numeric observations is the sum of that set of observations divided by the number of observations.
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If there is zero deviation all the observations are 50.
Given a set of data, order the observations by size. Then divide the set into four such that each part contains a quarter of the observations. These are the quartiles.