Ajournalist on a news show states that most insect repellents can harm the nervous system of infants. should you consider the journalist’s statement to be a scientific fact? a. yes, it makes sense that insect repellents could harm babies. b. no, only statements made by scientists are scientific facts. c. yes, journalists always thoroughly research their reports. d. no, a journalist is not an expert on medical science.

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.