Dr. Turk studied the relationship between age and reading comprehension, specifi cally predicting that older people will show lower comprehension than younger ones. Turk was particularly interested in comprehension of material that is available in the general press. Groups of participants who were 20, 30, 40, and 50 years of age read a chapter from a book by theoretical physicist Stephen W. Hawking (1988) entitled A Brief History of Time: From the Big Bang to Black Holes. After reading the chapter, participants were given a comprehension measure. The results showed that there was no relationship between age and comprehension scores; all age groups had equally low comprehension scores. Why do you think no relationship was found? Identify at least two possible reasons.