Science homework ! which of these statements best explains why scientists use models? a. to allow other scientists evaluate their data b. to speed up or slow down natural processes c. to describe and explain non-observable objects and processes d. to predict the scientific theories which would be proposed in the future

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.