Notes pg33-41

# Notes pg33-41 - 1 Summa ry Statistics Recall that...

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1 Summary Statistics Recall that descriptive statistics consists of tabular and graphical displays of data and summary statistics. Summary statistics are numerical values computed from a data set. They provide information about some aspect of the data set. The most common summary statistics are averages , measures of location , and measures of dispersion . Averages. There are many different averages that can be computed for data sets. The most common are the (arithmetic) mean, the weighted mean, the median and the mode. Mean The most frequently used average is the (arithmetic) mean. Typically, when people say “the average” they most often mean the mean. Mean—the arithmetic center of a set of quantitative, interval/ratio level data.

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The mean is the balancing point (the center of gravity) for the data set. The population mean, “mu” is computed using the formula: where: μ is the population mean (mu) x is the individual value in data set N = population size The convention is the use Greek letters to represent the aspect of a population that is of interest (the parameter). Parameter—a descriptive measure of a population. Example : The number of freshman that reside in each of the 6 dormitories of Greer University are: 302, 291, 280, 178, 135, 117
3 The mean for the number of students in a dorm at this University is: = Another example

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Notes pg33-41 - 1 Summa ry Statistics Recall that...

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