The following is a control chart for the average number of minor errors in 22 service reports UCL ... LCL o. Calculate the observed mean, expected mean, standard deviation and z value for the median and up/down test. Use z= +-2 to compare your z test scores. (Negative amounts should be indicated by a minus sign. Round your answers to 2 decimel places.) Test Observed Expected Std dev Median Up/Down b.Based on your calculation conclude whether the test is random or non-random. Test Conclusion Median Random Non random Up/Down

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