an experimenter is studying whether cell phone use and attention span are related. they ask people how many hours a day they are on the phone and then have them complete a difficult puzzle and measure completion time.

Suppose you need to verify how to correctly use commas. you open your english textbook and scan the chapter titles. in which one would you most likely find the information you need? a. correct capitalization b. grasping grammar c. super spelling d. proper punctuation