control chart

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April 15th, 2022

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

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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