Definition of Statistics in the narrow sense can be interpreted as data. Meanwhile, in the broad sense, statistics is a tool, a tool for analysis, and tool to make decisions.
There are two kinds of statistics:
1. Descriptive Statistics
Descriptive statistics is statistics used to describe or analyze the statistical results of the study, but it is not used to make broader conclusions (generalization or inference).
Research that does not use samples, the analysis will use descriptive statistics. Similarly, studies that use sample, but the researchers do not intend to make a conclusion on the population from which the sample is taken, the statistics used is descriptive statistics. In this case, Correlation and Regression techniques can also serve as Descriptive Statistics.
2. Inferential Statistics
Inferential statistics is statistics used to analyze the sample data, and the results will be generalized (interferenced) for population in which the sample is taken.
Inferential Statistics can be divided into parametric and non-parametric statistics. Parametric statistics is used to analyze the interval data or ratio, which is taken from a normally distributed population.
Non-parametric statistics is used to analyze nominal and ordinal data from free distribution of population. So it should not be normal. In this case, Correlation and Regression techniques can act as inferential statistics.
