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there are 12 girls and 14 boys at the skating rink and there are 18 girls 21 boys at the birthday party. are the girls to boys ratio at the two events proportional? true or false

How can the correlation in the scatter plot graph below best be described? positive correlation negative correlation both positive and negative no correlation

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

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