BACK TO LIST OF CLASSES Textbook Old Class Slides New Class Slides Class 4 - X-bar, part 1 of 5Class 4 - X-bar, part 2 of 5 Class 4 - X-bar, part 3 of 5 Class 4 - X-bar, part 4 of 5 Class 4 - X-bar, part 5 of 5