18) The government of a town needs to determine if the city's residents will support the construction of a new town hall. The government decides to conduct a survey of a sample of the city's residents. Which one of the following procedures would be most appropriate for obtaining a sample of the town's residents? A) Survey the first 400 people listed in the town's telephone directory. B) Survey a random sample of employees at the old city hall. C) Survey a random sample of persons within each geographic region of the city. D) Survey every 13th person who walks into city hall on a given day. 19) What generally happens to the sampling error as the sample size is increased?

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