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The Gallup Poll has decided to increase the size of its random sample of voters from about 1500 people to about 4000 people. The effect

The Gallup Poll has decided to increase the size of its random sample of voters from about 1500 people to about 4000 people. The effect of this increase is to:

increase the confidence interval width for the parameter.

reduce the variability of the estimate.

increase the standard error of the estimate.

have no effect because the population size is the same.

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