What is an example of measurement in the real world?

The answer is exemplified in the context of measurement as it pertains to data collection methods. The interviewer asking a question is a direct instance of measurement because it involves actively seeking specific information from participants. This action captures responses that can be quantified and analyzed, thereby contributing to empirical research.

In research methods, measurement often refers to how data is operationalized and collected. The interviewer's role in asking questions is critical as it directly influences the responses received, ensuring that the information gathered is relevant and aligned with the study's objectives.

The other choices represent forms of data collection, each with its unique characteristics, but they do not illustrate measurement in the same direct way. Email surveys and online polls are specific methods for data gathering, while focus group discussions provide qualitative insights into preferences. However, it is the act of the interviewer engaging directly with respondents that exemplifies a traditional understanding of measurement within communication research.