Basic Concepts In some experiments,the outcomes are numerical. E.g.stock price. In some other experiments,the outcomes are not numerical,but they may be associated with some numerical values of interest. Example.Selection of students from a given population,we may wish to consider their grade point average. The students are not numerical,but their GPA scores are.Basic Concepts  In some experiments, the outcomes are numerical.  E.g. stock price.  In some other experiments, the outcomes are not numerical, but they may be associated with some numerical values of interest.  Example. Selection of students from a given population, we may wish to consider their grade point average.  The students are not numerical, but their GPA scores are