How can the mean of the values in a numerical data set be calculated? A
Order the values in the data set from least to greatest, then find the middle value.
B. Find the sum of the values in the data set, then divide by the middle value in the set.
с
Find the sum of the values in the data set, then divide that sum by the number of values in the set
D
Order the numbers in the data set from least to greatest, then subtract the least value from the greatest value.

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