HDEV 4th Edition by Spencer Rathus

تمرين 9

A study found that African Americans who attend church regularly live an average of 13 years longer than African Americans who never attend. As a skeptical scientist, you recognize that this study may show that
A) church attendance causes longevity.
B) people who do not attend church are too sick to attend.
C) people who do not attend church get into trouble and develop health problems.
D) people who choose to attend church may differ from those who do not.