1. (a)
education: college professors' time how do college professors spend their time?
the national education association almanac of higher education gives the fol-
lowing average distribution of professional time allocation: teaching, 51%; research,
16%; professional growth, 5%; community service, 11%; service to the college,
11%; and consulting outside the college, 6%. make a pie chart showing the allo-
cation of professional time for college professors.

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