PTS:139.The following information regarding the number of semester hours taken from random samples of day and evening students is provided.DayEvening1612s43n4037Develop a 95% confidence interval estimate for the difference between the mean semester hours taken by the two groups of students.
PTS:140.The following data present the number of computer units sold per day by a sample of 6 salespersons before and after a bonus plan was implemented.SalespersonBeforeAfter136275366487578698At 95% confidence, test to see if the bonus plan was effective. That is, did the bonus plan actually increase sales?
0PTS:141.Zip, Inc. manufactures Zip drives on two different manufacturing processes. Because the management of this company is interested in determining if process 1 takes less manufacturing time, they selected independent samples from each process. The results of the samples are shown below.Process 1Process 2Sample Size2722