Suppose we conducted a sample of a population. How do we draw conclusions from this resultant amount of data? Before we can consider creating hypotheses concerning population trends and tendencies, we must catalogue and process the data in order to increase our understanding of it. Descriptive Statistics involve a variety of processes which will enlighten us to the nature of the collected data.
Measures of central tendency, or averages, are attempts to assess the value at the center of populations and samples. They include the Mean, Median, and Mode.
Measures of dispersion give us an idea of the variability, or spread, of values within a population and sample. They include The Variance, Standard Deviation, Range, Standard Error of the Mean, Kurtosis and Skewness. For both Measures of central tendency and dispersion, the nomenclature differs when discussing either Populations or samples.
Descriptive Statistics for the Population
Descriptive Statistics for Samples