Final answer:
Quantitative research using UPC codes at checkout counters represents secondary data. This data comes from existing records and is not collected firsthand by researchers.
Step-by-step explanation:
Research that is quantitative and uses data gathered from the UPC codes at checkout counters is called C) Secondary data. This type of data is information that has been collected previously by another party for a different purpose. When researchers analyze existing datasets such as sales records from UPC codes, they are utilizing secondary data. This is in contrast to primary data, which would involve the researchers collecting the data themselves through methods like surveys or experiments.
In other contexts:
- The number of times per week is quantitative discrete data.
- Duration (amount of time) is quantitative continuous data.
- Using secondary data is considered nonreactive or unobtrusive.