Geoff Black is the owner and president of Black Manufacturing. He has a passion for process improvement and has invested in his employees over the years to help them be more productive. Recently he hired a consulting firm to come into his plant and provide specialized training to employees who work on one of the production lines. Prior to the training, the consultant selected a sample of employees and measured the time in minutes that it took each employee to complete a specific task. Then, after the training, the employees were measured again on this same task and the times were recorded. The data are in the file called Black. Geoff is interested in seeing whether there is a linear relationship between the pre-training times and the post-training times.
a. (1) Develop a plot showing the relationship between the two variables. (2) Describe the relationship as being either linear or curvilinear.
b. (1) Develop a simple linear regression model with post-training time as the dependent variable. (2) Write a short report describing the model and indicating the important measures.