Which of the two population does new measurement belongs to?

by user2145299   Last Updated September 11, 2019 18:19 PM - source

I have a sample of size 150K from one population of measurements, and another sample of size 1000 from a second population. I receive a new measurement and need to decide which population it is coming from? given the huge difference between the sample sizes, what is the best method to decide which population the new measurement belongs to?

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