Randy, 10 years of age, was hit by a car while riding his bicycle and sustained a fractured right femur that was classified as a complete fracture. on arrival to the emergency department, randy was alert, vital signs stable, and he complained of pain "only if i move." randy's mother gave consent for treatment and admission. after x-rays, randy was taken to the operating room for application of traction to his leg.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.