Use the sample data below to answer the following question(s). The paired data consist of the cost of regionally advertising (in thousands of dollars) a certain pharmaceutical drug and the number of new prescriptions written (in thousands). Cost 9 2 3 4 2 5 9 10 Number 85 52 55 68 67 86 83 73 Find the percentage of the total variation in the number of new prescriptions written that can be explained by the variation in the cost of regionally advertising a certain pharmaceutical drug. Find the standard error of estimate se. please explain how to find both answers (don't use tech to find the answer for you).