Final answer:
Option D: The measure unrelated to human factors is 'd. time taken to accomplish a maintenance function (T).' For your company's operations, budgeting 1.1 hours per technician may not be sufficient given the average service time and standard deviation.
Step-by-step explanation:
The question revolves around determining if a measure is not related to human factors in a business setting, specifically within the context of maintenance operations. The correct answer to the question is d. time taken to accomplish a maintenance function (T) because this measure is more concerned with the efficiency or duration of maintenance tasks rather than human factors such as mean time between maintenance (MTBM), cost/operator personnel per hour, or operator labor hours per system operation hour. In relation to your company's operations, given that the average time to service one air conditioning unit is one hour, with a standard deviation of one hour, planning to budget an average of 1.1 hours per technician for a sample of 70 units may not be sufficient. This does not account for variability as captured by the standard deviation.
The measure of interest for human factors that is not included in the given options is mean time between maintenance (MTBM). MTBM is a measure of reliability and is used to assess the average time between two consecutive maintenance actions on a system or equipment. It is not directly related to operator personnel, operator labor hours, or the time taken to accomplish maintenance functions.