Need some explanation on Question 2
Can you tell me why visiting 200 start-ups in a random manner cannot be considered representative? does picking the random 200 startups from random silicon valley violated the representativeness of sample data?
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Because the population of interest is USA, so the 200 start-ups should be randomly selected from the whole USA (i.e. the sampling procedure should include all start-ups in the USA, instead of only from Silicon Valley).
If the researcher is interested in the study of start-ups in the Silicon Valley only, then a sample of 200 start-ups would be represenative.
Hope this helps.
