As owner of a small security firm you use CERs to develop most of your cost estimates. You are bidding on a contract that is the largest in your companys history and will involve about 20 sensors. Below are your historical records on installing these types of sensors? Using Excel fit a linear regression model for your CER. Based upon R² and plot of the data is a linear model appropriate? Number of Sensors Integration and Installation Person Hours/Sensor 2 12.4 5 16.6 5 14.6 9 27.7 9 28.3 11 42.9 15 77.6