Van is studying the effects of an indoor pool temperature on the number of swimmers. He made
this histogram to display his data.
Which statement is best supported by the data?
A:The pool has the least number of swimmers
O when the temperature is between 71 and
75°F.
B:The temperature of the pool doesn't
influence the numbers of swimmers.
C:The pool has the greatest number of
swimmers when its temperature is between
81 and 85°F.
D:More people swim when the temperature of
the pool is the warmest.

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