Stats are more interesting than it used to

#3
Let me explain:

My average monthly jobs are 70k,out of which 20% are cancelled and 80% are completed.

Now we do random survey of approx 3000 customer in a month to gauge NPS and stakeholders at times not always raise a question,if our data for survey was random or not.

one way is to show simple % in overall data vs % in 3000 survey data.but i want to know an effective way in statistics.
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