Study of the Normality of a Distribution

Podaºcã Raluca ()
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Podaºcã Raluca: Petroleum- Gas University of Ploiesti

Ovidius University Annals, Economic Sciences Series, 2014, vol. XIV, issue 1, 397-400

Abstract: Distributions of many natural phenomena are at least approximately normally distributed. The normal distribution is very important in studying economical phenomena because many variables measured in economics research have distributions that quite closely approximate the normal curve. Because they occur so frequently, there is an unfortunate tendency to invoke normal distributions where they may not be applicable. The purpose of the article is to present the methodology necessary to decide whether a distribution is normal or not. This includes the graphical representation, the calculation of the mean, of the standard deviation, of the theoretical absolute frequencies and finally the application of the chi-squared test.

Keywords: the normal curve; the normal distribution; the chi- squared test (search for similar items in EconPapers)
JEL-codes: C12 C50 (search for similar items in EconPapers)
Date: 2014
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