Aperson gets on and off a bathroom scale four times. the four readings (in pounds) are 148, 151, 150, and 152. each time after the person gets off the scale, the reading is 2 lb. is it possible to estimate the uncertainty in these measurements? if so, estimate it. if not, explain why not. is it possible to estimate the bias in these measurements? if so, estimate it. if not, explain why not.

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