In 2012, pollsters at Gallup introduced ________ to their poll when they mistakenly overestimated Latino support for the Republican candidate, Mitt Romney.

The pollsters at Gallup introduced a selection bias to their poll when they mistakenly overestimated Latino support for the Republican candidate, Mitt Romney.

What is a selection bias?

This refers to an error of selection of individuals or data for analysis in such a way that proper randomization is not achieved amd thereby failing to ensure that the sample obtained is representative of the population intended to be analyzed.

Most time, the selection bias occurs when the researcher decides who is going to be studied and it often associate with research where the selection of participants isn’t random such as with observational studies.

Hence, the answer is that the pollsters at Gallup introduced a selection bias to their poll when they mistakenly overestimated Latino support for the Republican candidate, Mitt Romney.