Every six months, doug is asked to fill out a survey asking when he expects to buy a new vehicle and what type and model he plans to purchase. doug, along with a group of consumers with similar buying habits, has been participating in this survey for the last eight years. the gathering of this quantitative data is an example of descriptive research using

a longitudinal design          

Explanation:

Longitudinal study: This is an observational method of research, that gathers data from the same participants frequently or repeatedly over a while. This research can take plenty of time, and it can extend over months, years or decades. Also known as a panel study or longitudinal survey.

Types of longitudinal studies:

1. Panel Study.

2. Cohort Study.

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where is the rest of the question. this isn't making sense. can you upload a picture of the question?