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Statistics is a branch of applied Mathematics that uses numbers to describe and analyze data collected by Research scientists.

A Scientific hypothesis is a possible Explanation for the behavior that will be studied that is stated in the form of A prediction.  It is based on gathered Facts and theories from previous studies.  It must be testable and stated in a way that it can be falsified.

Null hypothesis is one of the two mutually Exclusive hypotheses that predicts there will be no relationship or change in Behavior(s) among the group(s) being measured, no sirve.

Research hypothesis is one of the two Mutually exclusive hypotheses that predicts there will be a relationship or Change in the behavior(s) measured.  
Variables are events or qualities that Can assume more than one value, such as gender that has the value of male and The value of female.

Independent variable is the factor in An experiment that is selected, manipulated, and/or controlled by the Experimenter and is intended to be the cause of changes or differences (if any) In the dependent variable.  

Dependent variable is the behavior Exhibited by participants in an experiment that is measured and collected for statistical Analysis.  Changes in participants’ Behavior depend on the influence of the independent variable, outcome ejemplo Viendo violent tv aqui es el nivel de violencia

Extraneous variable is any variable That can vary along with the independent variable. Researchers must hold it Constant (keep it from varying) because they won’t know for sure whether it was The independent variable(s) or extraneous variables that caused or didn’t cause Changes or differences in the dependent variable.

Population is all the members of a Specified group.  Its size can be very Small, extremely large, or may not be known depending on how the particular Group of interest is defined.

Sample is a small and relatively Representative group that was selected from a population.   
 
Parameters are Statistics that describe population values.