Medical Wonders Is a Specialized Interior Design Company Focused on Healing

Medical Wonders is a specialized interior design company focused on healing artwork.The CEO,Kathleen Kelledy claims that artwork has healing effects for patients staying in a hospital,as measured by reduced length of stay.Her current client is a children's cancer hospital.Kathleen is interested in determining the effect of three different pieces of healing artwork on children.She chooses three paintings (a horse photo,a bright abstract,and a muted beach scene) and randomly assigns six hospital rooms to each painting.Kathleen's experimental design is a ________.

A) factorial design
B) random block design
C) normalized block design
D) completely randomized design
E) fractional design