Suppose a biologist is studying the population of fish in freshwater lakes. he collects data on the number of different species of fish found in 20 lakes. the boxplot displays the results of the study with species of fish in intervals of 50. on a boxplot, the left whisker starts between 150 and 200 species and the right whisker ends at 650 species. the box begins at 250 species, ends at 450 species, and is marked with a line segment between 350 and 400 species. create a five-number summary of the data set. round values to the nearest 25 species.

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