If a pollster wants to increase their ability to predict the outcome of an election, one thing they can do is increase the size of the sample. By doing so:

Increasing the sample size generally reduces sampling variability, so the poll’s estimate is more precise. It does not eliminate nonresponse or guarantee an unbiased sample; those depend on how people are selected and whether they respond. A larger sample also cannot make the pollster certain of the election outcome.

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