Taking a Broader Perspective: the Problem of External Validity All

Multiple Choice

Taking a Broader Perspective: The Problem of External Validity All of these are examples of unobtrusive measures except

A) comparing the condition of trails leading to natural park attractions to measure popularity.
B) counting the number of cans along a highway to measure littering.
C) randomly interviewing individuals at shopping mall to determine community attitudes towards pornography.
D) recording eating behavior of obese and thin diners without their knowledge.