From a recent production run of compact fl uorescent (cf) bulbs, you select a random sample of 10 bulbs. using an accelerated bulb life simulation, you fi nd that the average life for the bulbs in the sample is 2440 hours, with a sample standard deviation of 60 hours. use these sample results to test, at the 5% signifi cance level, the null hypothesis that the average life for the full population—the entire production run—of bulbs is pre-cisely 2500 hours, no more and no less. report your con-clusion and explain. "