An urban economist is curious if the distribution in where Oregon residents live is different today than it was in
1990. She observes that today there are approximately 3,109 thousand residents in NW Oregon, 902 thousand
residents in SW Oregon, 244 thousand in Central Oregon, and 102 thousand in Eastern Oregon. She knows that in
1990 the breakdown was as follows: 72.7% NW Oregon, 20.7% SW Oregon, 4.8% Central Oregon, and 2.8%
Can she conclude that the distribution in residence is different today at a 0.05 level of significance?
0.0/ 1.0 Points
Question 8 of 20
A college prep school advertises that their students are more prepared to succeed in college than
other schools. To verify this, they categorize GPA’s into 4 groups and look up the proportion of students at a state
college in each category. They find that 7% have a 0-0.99, 21% have a 1-1.99, 37% have a 2-2.99, and 35% have a
3-4.00 in GPA.
They then take a random sample of 200 of their graduates at the state college and find that 19 has a 0-0.99, 28 have
a 1-1.99, 82 have a 2-2.99, and 71 have a 3-4.00.
Can they conclude that the grades of their graduates are distributed differently than the general population at the
school? Test at the 0.05 level of significance.