Atest for marijuana usage was tried on 235235 subjects who did not use marijuana. the test result was wrong 44 times.
a. based on the available results, find the probability of a wrong test result for a person who does not use marijuana.
b. is it "unlikely" for the test to be wrong for those not using marijuana?
consider an event to be unlikely if its probability is less than or equal to 0.05.

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