Publisher Summary This chapter describes various methods for statistical analysis. Data is available in vast quantities in all areas of telecommunications. The most common method of presenting data is by tables and graph; to convey information quickly, pictograms, pie charts, and bar charts may be used. The average represents the central figure of a series of numbers or items. Mean deviation is found by taking the mean of the differences between each individual number in the series and the arithmetic mean, or median, of the series. Standard deviation is the most common measure of dispersion. The range is the difference between the smallest and largest value. Combinations are the number of ways in which a proportion can be chosen from a group. When sequencing within each combination is involved, the result is known as a permutation. Regression is a method for establishing a mathematical relationship between two variables. Several equations may be used to determine this relationship, the most common being that of a straight line. Several mathematical formulae with well-defined characteristics and these are known as probability distributions. Some of the probability distributions are binomial distribution, Poisson distribution, Wiebull distribution, and normal distribution. A sample consists of a relatively small number of items drawn from a much larger population. This sample is analyzed for certain attributes and it is then assumed that these attributes apply to the total population, within a certain tolerance of error.