Type 1 2 Errors

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    If I run a proportion or average hypothesis test and obtain a p-value less than .05, do I need to complete a power and sample size analysis to assess the probability of detecting a certain shift with certain sample size? 



    You can run the Power and Sample Size test via MTB before or after data collection, depending on where you are in your project.
    Ideally, you run it before so as to collect the proper sample size for a given level of precision and power.  If you have already collected your data, then at least run it so as to quantify the above elements given your current sample size.  
    Always consider what questions your data needs to answer before you get to collection…this allows you to choose the proper data form and subsequent analytics….I would rather design the data collection around the analytics than the analytics around the data collection…just my opinion.
    Good Luck.

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