Randall's family drove to the beach for vacation.
they drove the same speed throughout the trip.
the first day, they drove 130 miles in 2 hours.
the second day, they drove 325 miles in 5 hours.
the third day, they arrived at the beach after driving for 6 hours.
how many miles did they drive on the third day?

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