Use the following information: Based on a study by Dr. P. Sorita Soni at Indiana University, we know that eye colors in the United States are distributed as follows: 40% Brown, 35% blue, 12% green, 7% gray, and 6% hazel.
Professor Kennedy collects eye color data from his students. What type of sample is this?
(1) Stratified (2) Random (3) Convenience (4) Cluster
Identify one factor that might make this particular sample biased and not representative of the general population of the United States.
If one person is randomly selected, what is the probability that this person will have brown or blue eyes?
If two people are randomly selected, what is the probability that at least one of them has brown eyes?