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CONTROL CHART

CONTROL CHART.

Problem 10-28

The following is a control chart for the average number of minor errors in 22 service reports.

Picture

a. Calculate the observed mean, expected mean, standard deviation and z value for the median and up/down test. (Negative amounts should be indicated by a minus sign. Round your answers to 2 decimal places.)
Test        Observed        Expected        Std. dev          z
Median
  Up/Down

I know some of these answers are incorrect. Please assist

CONTROL CHART

Solution:

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