Sample Name, Obs1, Obs2, Obs3, Obs4, Obs5
I try to create a XBar chart using Analyze|Quality and Process|Control Chart|Xbar
I fill in:
Process: Obs1, Obs2, Obs3, Obs4, Obs5
Sample Label: Sample Name
Sample Size: Checked Sample grouped by Sample Label
I get the message:
All samples have sample size equal to 1. XBar charts require sample size greater than 1. IR Charts may be more appropriate.
I want an XBar chart using sample means of Obs1-5, in group by sample name but it keeps giving me IR charts on each Obs.
What am I missing?