Pretend you're playing a carnival game and you've won the lottery, sort of. you have the opportunity to select five bills from a money bag, while blindfolded. the bill values are $1, $2, $5, $10, $20, $50, and $100. how many different possible ways can you choose the five bills? (order doesn't matter, and there are at least five of each type of bill.) a. 56 b. 120 c. 288 d. 462

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