In order to obtain a sample of law firms a list of all lawye

In order to obtain a sample of law firms, a list of all lawyers in the city was atained and 7 lawyers were selected at random. The law firms to which those lawyers belonged were then selected. Do you have a random of law firms?

Solution

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No, you don\'t. If you took samples directly from the list of LAW FIRMS, and not LAWYERS, you\'d have a random list.