(Parametric Statistics) is a statistical method that must be followed. Agreement as follows
: 1. Information required in levels over and over.
2. The data from the sample to be analyzed is the normal curve.
3. Population in each group The study must have equal variances.
Statistics of this type, such as t-test, Z-test, ANOVA, Regression, etc..
2.2 statistical parameters are (Nonparametric Statistics) a statistical approach. Available without a preliminary agreement. The statistics are in this category, such as chi-square, Median test, Sign test, etc..
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