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Nonparametric Statistics

Unlike parametric statistics, which deals with tests for ratio and interval variables, nonparametric statistics deals with tests for nominal and ordinal variables. It is then concluded that population parameters and estimates are disregarded in the following tests. According to Fonseca (1996), nonparametric tests are very interesting for qualitative data when working with small samples (less than 30).
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Oriental Mathematics (part 4)

Historical Context Archaeological excavations at Mohenjo Daro give us an indication of a very ancient civilization and a very tall culture in India, which occurred at the same time as the pyramids were built in Egypt. Later the country was occupied by the Aryan invaders who imposed the caste system, which brought a very long delay to development.
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Alexis Claude Clairaut

Alexis Claude Clairaut was born on May 7, 1713 in Paris (France) and died on May 17, 1765, also in Paris. The son of a French mathematician from whom he received his training, he became one of the earliest and most celebrated mathematicians in history. He studied calculus at the age of 10, published his first mathematical work at 13, and wrote a mathematical treatise at 18.
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Unreasonable, square or squared

One day I was told that I should be rational, So in math class I was wondering… If I should be rational why study irrational equations? Well, it's a terrifying and unthinking thing! My God, what a contradiction these people we call society! After studying so much I realized that this name came in handy, simply because there is a square root that has a variable or unknown if you prefer ... After I discovered this, I realized that was getting high, For beyond the square root was necessary to fix the house… thing I always hated, how many beatings I washed from my poor fighting mother Because of my omission in the housework.
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Mathematical Challenges

Check out all our challenges below. See also the book with the main challenges and puzzles of the website Just Mathematics, all with the answers commented. Ask yours now! Filter by difficulty level Very easy (8) Easy (49) Medium (96) Difficult (31) Very difficult (9) Displaying 193 challenges at all levels: Challenge 1 The Age Problem Challenge 2 Combinatorial Analysis Challenge 3 Age Ratio Challenge 4 How many triangles?
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Variability

Total Amplitude: Defined as the difference between the largest and smallest observations. For example, the amplitude between 8 12 14 16 18 is 10. Standard Deviation (SD): SD is the square root of the variance. It is a measure of variability that takes into account all the information contained in the sample. An example like the following illustrates well the application of the standard deviation measure.
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