Collect a real data set consisting of a sample of at least forty observations (n=>40). Your data should include two quantitative (QN) variables (designated y and x1) and one qualitative (QL) variable (designated x2). Data must be from a verifiable source.
Example y= salary of USF professor (QN), x1= years of experience (QN), x2= Male or Female
Note: You must select a QL variable (x2) with exactly 2 levels and about the same number of data points for each level, e.g 20 males and 20 females. Also, for each level of the QL variable you should have 3 different values of the QN variable x1. e.g, 5, 10, and 15 years of experience for both males and females.