Sometimes panel data is based on _______, which is an observational research method that collects data from products purchased at a retail store's checkout counter.
A) online data
B) secondary data
C) scanner data
D) the Pareto principle

Question

Quizplus · Accepted Answer

Scanner data is collected from products purchased at a retail store's checkout counter, often used in panel data analysis.

Sometimes Panel Data Is Based on _______, Which Is an Observational