An ecologist randomly samples 9 plants of a speaific species and measures their heights. He finds that this sample has a mean of 15 cm and a standard deviation of 4 cm. If we assume that the height measurements are normally destritbuted, find a 99% confidence interval for the mean height of all plants of this species. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one deamal place. (If necessary, consult a list of tormmdas.) What is the lower imit of the confidence interval what is the upper imit of the contidence interval?