Physical activity is a measure of fitness. However, physical activity also correlates with good health, which is also a measure of fitness. This type of correlation between two measures of the same construct is an example of

Your friend Dorothy is upset because her adopted 13-year-old daughter is overweight. No one else in the family has a weight problem

What can you tell Dorothy about the influence of heredity and environment on one's weight? What advice can you give Dorothy about weight loss in children? What will be an ideal response?

Which of the following strategies is least likely to reduce subject reactivity?

A) Compensating participants for their time commitment. B) Adorn the laboratory with materials that are appealing to a target population. C) Careful training of the research assistants. D) Providing a thorough informed consent process.