A Researcher Gave Jaunita and Her Husband a Bar-Coded Card,like

Multiple Choice

A researcher gave Jaunita and her husband a bar-coded card,like a frequent-shopper card,that they give to the checkout clerk at the grocery store.Their code number is coupled with the purchase information recorded by the scanner.This family is participating is a(n) :

A) scanner-based consumer panel
B) obtrusive observation study
C) phenomenological study
D) ethnographic study