Professor John Juniper Was Interested in Using Statistics Canada Data

Multiple Choice

Professor John Juniper was interested in using Statistics Canada data to examine trends in Canadian unemployment rates over the last 40 years;however,he found that the official definition of "unemployment" used to collect unemployment statistics differed from year to year.Which of the following issues complicates matters for him?

A) Reliability
B) Validity
C) Ecological fallacy
D) Ideal types
E) The coding frame is invalid