*Please Tell True & False*

1) The objective of using control charts is to detect chance causes. [ ]

2) The specification limits depend on process data. [ ]

3) The out of control ARL can be calculated by the type I error. [ ]

4) The width of action control limits is larger than the warning control limits. [ ]

5) The x-bar control chart is a type of Shewhart chart. [ ]

6) If the sample size is very large, the results of statistical inference could be free of error. [ ]

7) In practice, we usually want both ARL0 and ARL1 to be as large as possible. [ ] 3

8) R chart is appropriate for variable sample size. [ ]

9) Quality improvement is the reduction of variability in processes and products. [ ]

10) For the x-bar & R charts, if both two charts have signals, we need to first check the R chart and eliminate the assignable causes from R chart, and then check the x-bar chart.