Dima called her friend to tell her that she saved 30% on her new skirt at a discount store. her friend told her that she could have gotten a better deal at a different store that was advertising a sale of off all clothing. if the original price of dima’s skirt was $54, how much more could she have saved at the store her friend suggested?
$1.11
$1.80
$36.00
$37.80

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