A Nevada Bank keeps track of errors from 20 clerks.Each sample has 100 records.They want to construct a P-chart to track the proportion of errors in each sample.The table below shows the number of errors per sample.(Use z=3 for control limit calculations.)

a.Determine P.
b.Determine σP.
c.Determine the 3-sigma UCL and LCL.
d.Does the process appear to be in statistical control?

Question

A Nevada Bank keeps track of errors from 20 clerks.Each sample has 100 records.They want to construct a P-chart to track the proportion of errors in each sample.The table below shows the number of errors per sample.(Use z=3 for control limit calculations.)
  
a.Determine P.
b.Determine σP.
c.Determine the 3-sigma UCL and LCL.
d.Does the process appear to be in statistical control?

Quizplus · Accepted Answer

The Answer of A Nevada Bank keeps track of errors from 20 clerks.Each sample has 100 records.They want to construct a P-chart to track the proportion of errors in each sample.The table below shows the number of errors per sample.(Use z=3 for control limit calculations.)
  
a.Determine P.
b.Determine σP.
c.Determine the 3-sigma UCL and LCL.
d.Does the process appear to be in statistical control?

A Nevada Bank Keeps Track of Errors from 20 Clerks