Independent and Dependent Variables Samantha, Who Reads "Dilbert" Daily, Wonders

Multiple Choice

Independent and Dependent Variables Samantha, who reads "Dilbert" daily, wonders whether students are more productive when they study in cubicles or in open rooms.She randomly assigns subjects to read chapters of high or low difficulty in cubicle or open room conditions and then measures the number of pages they complete in an hour.What was the environmental variable in Samantha's study?

A) difficulty of reading material
B) number of completed pages
C) reading ability
D) room configuration