Test for Equal Variance

Also known as the Homogeneity of Variance (HOV), it is a statistical tool that compares the standard deviation or variances between a continuous (a.k.a. variable or numerical) value and two or more discrete (a.k.a. attribute or categorical) values. 
Related StatStuff Video: 
   -Section 6-Analyze Phase, Lesson #25 - Hypothesis Testing: Spread (Compare 2+ Factors)