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Data Analysis with R - Second Edition by Tony Fischetti

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The normal distribution

Do you remember in Chapter 2The 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.

Figure 4.3: Normal distributions with different parameters

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

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