suppose that the five manufacturing plants in your business have been averaging 40 minutes of downtime per day for the past several years, but during the past year, there has been a significant effort by both management and production workers to reduce downtime. In an effort to determine if downtime has been significantly reduced company productivity, researchers have sampled 40 days over the past several months from the company records at each of the five plants and recorded their daily downtimes. Formulate the hypothesis.