The most common and obvious fossils are the preserved skeletal remains of animals. Other fossils, which are also evidence of past organisms, include leaf impressions, tracks and trails, burrows, droppings, and root casts.
Lesson Summary. Non-experimental research does not mean nonscientific. Non-experimental research means there is a predictor variable or group of subjects that cannot be manipulated by the experimenter. Typically, this means that other routes must be used to draw conclusions, such as correlation, survey or case study.
Non-inferiority clinical trial: A clinical trial that shows that a new treatment is equivalent to standard treatment.Also called a non-inferior trial. See: Clinical trials. See also: Inconclusive clinical trial; Negative clinical trial; Positive clinical trial.on-inferiority clinical trial: A clinical trial that shows that a new treatment is equivalent to standard treatment.