Question: Please help. This is my second time posting this question and the first response was incorrect. Thank you! The following is a control chart for

Please help. This is my second time posting this question and the first response was incorrect. Thank you!

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. Use z=+/2 to compare your z test scores. (Negative amounts should be indicated by a minus sign. Round your answers to 2 decimal places.) b.Based on your calculation conclude whether the test is random or non-random

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