Contribution: Dr. José María Villarías
If I remember correctly, the analysis of variance allows us to know if there are significant differences between two samples, ie, if the frequency of occurrence of responses among a population of, say, 25 people randomly selected years are significantly different from another town, also chosen at random, people of 45 years (also, for example) with a degree of reliability as a percentage (which is becoming increasingly based on the sample As you approach the world population.) As one can not work with the whole universe, they choose to work with a sample and estimate the extent of their results, ie the sample X, we have a degree of confidence of 66%, 75% or 99%. There are tables that allow us to decide this.
Moreover, there is also a method of multiple variance analysis, modification or extension of the above, applicable to the present case, in which more than two variables (age, education, social environment, etc.). (...) These studies are speaking from a consideration of "systemic" non-systematic (or statistics).
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