A school wants to add a new sports team. The school sent out surveys asking for the students favorite sport. 13 students named hockey. Others named volleyball and lacrosse. Use paper and pencil. explain how to use the circle graph and ratios to find the number of students surveyed. then find this number. volleyball 28%
hockey 52%
lacrosse 20%​

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