We use run charts to test for randomness. First, we subtract the number of runs we expected from the number of runs we observed. Second we divide that result by one standard deviation. Why do we do that division?

Group of answer choices

To see if there is any bias to the process (if it is non-centered)

To see whether or not we need to use control charts

To give scale to the difference between the number of runs expected and the number observed.

To see if the test involves a problem with the up/down or the above/below issue.