A researcher is trying to understand the relationship between employees’ salary and other relevant factors. A sample of 80 employees contains their current annual salary (in dollars), their years of experience in the industry (YrsExp), their years of experience with this company (YrsHere) and current level in the company (Level), coded 1 to 4, where 1 indicates the lowest level and 4 the highest. The estimated regression model for salary is given below.