What are the invalid ways to conduct a poll according to professional pollsters?

The principle of random sampling, or randomly choosing people for the poll in a manner that draws a diverse sample, is vital to having an accurate poll.

Explanation:

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monopolies  came to the united states with the colonial administration. the large-scale public works needed to make the new world hospitable to old world immigrants required large companies to carry them out. these companies were granted exclusive contracts for these works by the colonial administrators. even after the american revolution, many of these colonial holdovers still functioned due to the contracts and land

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