The 5th graders are going to paint miniature self portraits in art class. Each student has a canvas that is 5.3 cm wide and 8.5 cm tall. The art teacher has 6 bottles of white paint for the background. Each bottle covers 220.8 square cm of canvas.

There are 30 students in the class.

Does he have enough paint for all the canvases? If not, how much more does he need?

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