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last year the number of skateboards produced per day at a certain factory were normally distributed with a mean of 20,500 and a standard deviation of 55 skateboards. answer the following.
on what percent of days last year did the factory produce 20,555 skate boards or fewer?

on what percent of days last year did the factory produce 20,610 skateboards or more?

on what percent of days last year did the factory produce 20,445 skate boards or fewer?
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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