Google Data Analytics Professional Certification Practice Test

What does a sample size refer to?

1. A portion of data that is accurate

2. A representative part of a population

3. The process of data collection

4. The total population being studied

The correct answer is: A representative part of a population

A sample size refers to a representative part of a population. When conducting research or data analysis, it is often impractical or impossible to collect data from every individual in a large population. Instead, researchers use a sample—a smaller subset that reflects the characteristics of the entire population. By ensuring that the sample is representative, analysts can make inferences about the broader population based on the findings from the sample. This approach allows for efficient data collection while maintaining the validity of the research conclusions. The other options do not accurately convey the definition of sample size. While a portion of data can be viewed as overlapping with the concept of a sample, it does not necessarily ensure representation. The process of data collection refers to the methods used to gather data rather than the size of the sample itself. Finally, the total population being studied encompasses all individuals within the group of interest, rather than the smaller subset used for analysis.