A Researcher Examines the Number of "Family-Size" Products on Supermarket

Multiple Choice

A researcher examines the number of "family-size" products on supermarket shelves in America and France,and concludes that Americans prefer larger-sized portions than do the French.A second researcher concludes that the number of members in a typical family is larger in American than in France.These different interpretations indicate that

A) both researchers are wrong.
B) the researchers are making inferences about controlled-use traces.
C) the validity of unobtrusive measures must be examined carefully.
D) time sampling should have been used.