The university data center has two main computers. The center wants to examine whether computer 1 is receiving tasks that require processing times comparable to those of computer 2. A random sample of 15 processing times from computer 1 showed a mean of 63 seconds with a standard deviation of 20 seconds, while a random sample of 14 processing times from computer 2 (chosen independently of those for computer 1) showed a mean of 50 seconds with a standard deviation of 15 seconds. Assume that the populations of processing times are normally distributed for each of the two computers and that the variances are equal, Construct a 90% confidence interval for the difference between the mean processing time of computer 1, , and the mean processing time of computer 2, . Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your responses to at least two decimal places. (If necessary, consult a list of formulas.) What is the lower limit of the 90% confidence interval? What is the upper limit of the 90% confidence interval? 0 X 5 ?