A random sample of 13 subjects was asked to perform a given task. The time in seconds it took each of them to complete the task is recorded below: 31, 28, 27, 26, 47, 38, 39, 32, 33, 39, 29, 38, 43 Send data to Excel If we assume that the completion times are normally distributed, find a 90% confidence interval for the true mean completion time for this task. 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.) What is the lower limit of the confidence interval? What is the upper limit of the confidence interval