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This week we learned about how to calculate the control limits in a real process based on the historical data measurements. Additionally, we connect the concepts of central tendency and variability in order to identify process conditions. Now you are able to make your own control chart and apply this simple context in different scenarios during the wastewater and water treatment processes.
According to the normal distribution, if we move 1 respect to the mean, what percentage of data lays on this range?:
If you pretend to calculate the confidence interval (ULC) or (LCL), what is the most appropriate value of Z?
According to the theory, the expression
is used when the replication for each group is:
According to the following control chart we can conclude
Note: data was collected each month.
Match the word to its meaning
It refers to how close a sample measurement is to the actual population value


It is the degree to which repeated measurements achieve the same results under unchanged conditions.


A certificate laboratory must ensure that all the results are:

