Simco Inc. is a manufacturer that purchased a new piece of equipment designed to reduce costs. After several months of operation, the results were quite unsatisfactory. The operations manager believes that the problem lies with the machine’s operators, who were unable to master the required skills. It was decided to establish a training program to upgrade the skills of those workers with the greatest likelihood of success. To do so, the company needed to know which skills are most needed to run the machine. Experts identified six such skills: dexterity, attention to detail, teamwork skills, mathematical ability, problem-solving skills, and technical knowledge. To examine the issue, a random  ample of workers was drawn. Workers were measured on each of the six skills through a series of paper-and-pencil tests and through supervisor ratings. In addition, each worker received a score on the quality of his or her actual work on the machine. These data are stored in columns 1 through 7. (Column 1 stores the quality-of-work scores, and columns 2 to 7 are the scores on the skill tests. All data are interval.) Identify the skills that affect the quality of work.