In the game of roulette, a player can place a $6 bet on the number 23 and have a 1 in 38 probability of winning. if the metal ball lands on 23, the player gets to keep the $6 paid to play the game and the player is awarded an additional $210. otherwise, the player is awarded nothing and the casino takes the players $6.

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