A company manufactures light bulbs. The company wants the bulbs to have a mean life span of 1000 hours. To maintain this average, random samples of 16 light bulbs are periodically tested. If the t-value falls between -t0.99 and t0.99, the company will be satisfied that it is manufacturing acceptable light bulbs. A sample of 16 light bulbs is randomly selected and tested. The mean life span of the sample is 955 hours and the standard deviation is 35 hours. Is the company making acceptable light bulbs? Assume life spans are normally distributed.