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R: Data Analysis and Visualization by Ágnes Vidovics-Dancs, Kata Váradi, Tamás Vadász, Ágnes Tuza, Balázs Árpád Szucs, Julia Molnár, Péter Medvegyev, Balázs Márkus, István Margitai, Péter Juhász, Dániel Havran, Gergely Gabler, Barbara Dömötör, Gergely Daróczi, Ádám Banai, Milán Badics, Ferenc Illés, Edina Berlinger, Bater Makhabel, Hrishi V. Mittal, Jaynal Abedin, Brett Lantz, Tony Fischetti

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The normal distribution

Do you remember in Chapter 2, The Shape of Data when we described the normal distribution and how ubiquitous it is? The behavior of many random variables in real life is very well described by a normal distribution with certain parameters.

The two parameters that uniquely specify a normal distribution are µ (mu) and σ (sigma). µ, the mean, describes where the distribution's peak is located and σ, the standard deviation, describes how wide or narrow the distribution is.

The normal distribution

Figure 4.3: Normal distributions with different parameters

The distribution of heights of American females is approximately normally distributed with parameters ...

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