A Study of 70-Year-Olds Finds That They Are More Likely

Multiple Choice

A study of 70-year-olds finds that they are more likely to vacation in January than younger individuals. What can be concluded?

A) Increased age caused participants to vacation more.
B) Sex of participant is a confounding variable.
C) Since age and cohort are confounding variables, it is not possible to determine whether increased vacations in January are due to age or historical time in which one lived.
D) Time of measurement is a confounding variable.