TABLE 14-1A mаnаger оf а prоduct sales grоup believes the number of sales made by an employee (Y) depends on how many years that employee has been with the company (X1) and how he/she scored on a business aptitude test (X2). A random sample of 8 employees provides the following: Referring to Table 14-1, for these data, what is the value for the regression constant, b0? (Hint: you need to create an excel file based on the data shown in the above table and then use R to do the analysis.)