Re: Xbar-R Chart - Need help to analysis
I would start by looking at your data collection process.
There is very little variation in the data per data series, except if it is near a high valued data series. There are no values less than 59.83 (which should naturally occur) and there are too many 59.83 values. The high data values do not look correct. The control chart suggests significant X-bar shifts, but the underlying data is close to a normal distribution.
Were the parts measured in series or after they lost their time sequence?