Here are my thoughts:
As Victor points out, there is not enough situational information to provide good advice, so take my input with a grain of salt. How was the data obtained? Do you know the measurement system error?
First, since you are asking about the use of JMP, if you could, in the future, attach JMP files instead of excel, that would be better.
I'm confused by the first question. The specification (i.e., voice of the customer) should be what the target value and acceptable variation around that target should be for performance that is required. Perhaps you use the term specification to mean something else? You may be able to determine what are the expected limits of variation as a function of your data set. I have attached a JMP data table with a script that will show a distribution of the pH values(click on the green arrow). There appears to be some outliers.
It does look like dosage 30 has some outliers associated with it (see result vs. dosage). See also IR of result.
"All models are wrong, some are useful" G.E.P. Box