An article reported that a survey of clothing worn by pedestrians killed at night in traffic accidents revealed that about 80 percent of the victims were wearing darkcolored clothing and 20 percent were wearing light-colored clothing. The conclusion drawn in the article was that it is safer to wear light-colored clothing at night.

(a) Is this conclusion justified? Explain.

(b) If your answer to part

(a) is no, what other information would be needed before a final conclusion could be drawn?