Use the following information: Based on a study by Dr. Delilah Re at Hounds Town
ID: 3236408 • Letter: U
Question
Use the following information: Based on a study by Dr. Delilah Re at Hounds Town 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 Re collects eye color data from her students. What type of sample is this? Stratified Random Convenience 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?Explanation / Answer
Answer:
3.
a).
Convenience sample.
b).
The sample is professor’s students and this is not a random sample .
c).P( brown or Blue ) = 0.40+0.35 = 0.75
d).P( Brown) =0.4 P( not brown) = 1-0.4=0.6
P( both are not brown) = 0.6*0.6=0.36
P( at least one is brown) = 1- P( both are not brown)
=1-0.36
=0.64