After observing the interaction between rival street gangs, Jet predicts that fighting between the gangs would decrease significantly if the existing "colors" (clothing) of the two gangs (one black and one red) were changed to pink and yellow. This prediction is most accurately thought of as a

A correlation is considered to be positive if:

both variables increase or decrease together. one variable increases while the other variable decreases. no connection between the two variables is seen. there is no instance of a positive correlation.

Which of these would you probably find by an "attentive" process?

a. A yellow book on a shelf of otherwise black books b. A book that someone dropped, that hit you on your foot c. A very large book among several small books d. A misspelled word on a page in a book