Ingrid needs to paint her bedroom walls. The room is 9 ft tall by 12 ft wide and 11 ft long. It has a door that is 7 ft tall by 3.5 ft wide and two
windows 3.5 ft by 3.5 ft that don't need paint.
How many gallons of paint should Ingrid buy if I gallon covers 102 square ft?
A. 2 gallons
B. 3 gallons
C. 4 gallons
D. 5 gallons
E 6 gallons

Aresearch study is studying the effects of a new drug for osteoporosis alzheimer's disease (ad) for women above the age of 65 years. a group of individuals with osteoporosis is randomized into two groups. one group is treated conventionally, and the second group is treated with the new medication. assessments are made at 3, 6, 12, 36, and 48 months. the conventionally treated group is assessed for ad using a serum blood test, and the treatment group is assessed for ad using a pet radiotracer that binds to beta-amyloid plaques. in comparing these 2 trial arms, the authors of the study may encounter which type of bias? a. selection bias on the risk of developing b. measurement bias c. confounding bias d. recall bias e. lead-time bias