2. A scientist read an article in a magazine about how air pollution can cause children to develop asthma. Since the article did not come from a peer-reviewed magazine, he doubted
the claim, instead believing that children living in a smog-filled city would not have an
increased chance of developing asthma. He wanted to test his own idea, so he formed a
hypothesis and planned out an experiment. The scientist decided to compare 10th graders
from three schools in smog-filled cities to 10th graders from three schools in smog-free rural
areas. He found out how many of these students had asthma and recorded his data in the
table below. After looking at the results, he was amazed at what a big risk factor living in a
smog-filled city was after all. (20 points)
Students in City Schools
Students in Rural Schools
School
Percent of
Percent of
Number of Number of
Number of Number of
students in
students in
students in oth graders
students in 10th graders 10th grade
10th grade
10th grade with asthma with asthma 10th grade with asthma
with asthma
1
492
126
3
249