Final answer:
The correct answer is option (b),
Step-by-step explanation:
According to O*NET, common skills that heating and air conditioning mechanics and installers need include troubleshooting, repairing, and installation. These are core skills necessary for professionals in this field to diagnose, fix, and set up heating, ventilation, and air conditioning (HVAC) systems efficiently and effectively.
In the context of energy conservation, energy consultants play a vital role. With high energy costs, these professionals have strong job prospects as they work to analyze and enhance the energy flow and maintain healthy air exchange in residential and commercial properties.
Concerning the quality by which air conditioners are judged, the correct answer is option (b): The amount of energy transferred by heat from a cold environment, compared with the required work input. This balance reflects the efficiency of the air conditioning unit.
For the company providing maintenance on air conditioners, investing an average of 1.1 hours per technician, based on previous data that indicates an average of one hour with a standard deviation of one hour, can be considered. However, it should be noted that a simple random sample of 70 units can have variation, and actual time required may vary. Therefore, careful planning and allowance for potential variances should be part of the company's scheduling and budgeting strategy.