A Researcher Wants to Know Whether Wearing Sunglasses Improves Driving

Multiple Choice

A researcher wants to know whether wearing sunglasses improves driving performance.If an independent groups design is used,the researcher would manipulate the variable by

A) randomly assigning half the drivers to a sunglasses condition and half to a no-sunglasses condition.
B) having all drivers first drive without sunglasses and then with sunglasses.
C) having half the drivers first drive without sunglasses and then with sunglasses and having the other half first drive with sunglasses and then without sunglasses.
D) selectively placing half the drivers to a sunglasses condition and half to a no-sunglasses condition.