An ecologist randomly samples 14 plants of a specific species and measures their heights. He finds that this sample has a mean of 13 cm and a standard deviation of

4 cm. If we assume that the height measurements are normally distributed, find a 90% 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 decimal place. (If necessary, consult a list of formulas.)