Below you are given a partial computer output relating the price of a company's stock (Y in dollars), the Dow Jones industrial average (X1), and the stock price of the company's major competitor (X2 in dollars). Source of variation Degrees of freedom Sum of Squares Mean Squares F Regression Error 20 240 Total 800 What has been the sample size for this regression analysis? At 0:20.05 level of significance, test to determine if the model is significant. That is, determine if there exists a significant relationship between the two independent variables and the dependent variable