How does the work of the national oceanic and atmospheric administration people? a. they monitor weather conditions and send out flood warnings b. they evacuate an area when a flood or landslide occurs c. they analyze seismic data and make predictions of future natural disasters d. they provide funding for areas damaged by natural disasters

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.