We are studying the waiting times arising from two queueing systems. Suppose we make four independent replications of both systems where the systems are simulated independently of each other. The average waiting times from each replication of the systems are shown in the table below. Assuming that the average waiting time results from each replication are approximately normal, find a two-sided 95% confidence interval for the difference in the means of the two systems. Replication System 1 System 2 10 25 2 20 40 3 25 30 4 35 20 O a. [-52.46, 39.96] O b. [-40.09, 27.59] O c. [-22.17, 9.67] O d. [-2.97, 14.67] O e. [12.46, 27.72]