A new pet food company wants to sell their prodict online and use social media to promote themselves. To determine whether to use a dog or cat as their mascot, they research the number of people who click on links with an image of a dog or a cat. Based on the shape of the distributions, what measure of center and measure of variability would you use t compare the distributions? Explain your reasoning.

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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