Suppose you have a theory that Education Level is related to Income Level (in $) by means of an intervening (mediator) variable (the number of hours per week spent online). You measure Education Level by means of the number of years of post-high school education. You obtain the following data for 15 subjects. Education Level Number of Hours per week Income 2 42 35,000 23 47,000 40,000 53,000 27,000 70,000 1 39 4 25 43 8 23 34 45,000 30,000 18,000 36 1 40 52,000 48,000 17,000 38,000 21 26 1 39 33 30 44,000 33,000 2 43 Perform all necessary statistical tests needed to test your theory that the number of hours online is a mediating variable between the education-income relationship. Be sure to include all null hypotheses tested and all conclusions reached.