Carman, C. (2012). Measures of central tendency. In N. J. Salkind (Ed.), Encyclopedia of research design (pp. 138-142). SAGE. Measures of central tendency are used to determine the middle area of a group of numbers. This section will describe the measures in order of importance and when to use each one of them.
Galyardt, A. (2018). Areas under the normal curve. In B. B. Frey (Ed.), The SAGE encyclopedia of educational research, measurement, and evaluation (pp. 120-121). SAGE.
This section describes the areas related to the normal distribution. It also discusses the relationship between probability and the areas under the normal curve.