To see if breast-feeding influences the incidence of the disease rickets, researchers study rates of breast-feeding of infants with and without rickets. This is an example of
A. experimental research.
B. observational research.
C. epidemiological research.
D. double-blind placebo-controlled research.
Question 2
It is very important in a double-blind, placebo-controlled study that all of the factors that could influence the study results are
A. completely different for the groups of subjects.
B. equal and opposite for the groups of subjects.
C. kept to a minimum.
D. kept the same for the groups of subjects.
Total fertility rates (TFRs) among major regions of the world.
Lyme Disease Concept Map
Rates of Car Injuries and Fatalities by Age
Major Findings of the High Scope Preschool Study High Scope participants showed better academic per
Ringworm is a local contraindication for massage. Centers for Disease Control and Prevention.
Disease Vector Icon