An analyst has gathered data and counted the number of runs with respect to the median. There were 60 observations and 22 runs.
What is the expected number of above/below the median runs?
What is the standard deviation of above/below the median runs?
What can the analyst conclude given this information?
The expected number of above/below runs would be
What is the z score associated with this test?
Is there any evidence of nonrandom variation? What is the evidence?