Here is a link to someone else that answered this question without the UCL and L

Question

Here is a link to someone else that answered this question without the UCL and LCL information. I cant figure out how they did it but maybe you can. The provided question does not give me that information.

https://www.chegg.com/homework-help/questions-and-answers/problem-10-28-following-control-chart-average-number-minor-errors-22-service-reports--calc-q11093805?trackid=633f18b2&strackid=2014c780&ii=1

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.)

b.Based on your calculation conclude whether the test is random or non-random

Test Observed Expected Std. dev z Median Up/Down UCL LCL

Explanation / Answer

Based on your calculation conclude whether the test is random or non-random

median :-random

up/down :- non random

test    observed    expected    st.deveation   z median 9.00+-0.5 12.00+-0.05 2.28+- -1.31+-0.05 up/down 14.33+-0.05 1.89+- -2.82+-0.05

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