control chart

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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  
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penka
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