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16 May 2009, 04:52
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Use POE, answer D
Fact:
1990's light rainfall days 1910's total rainfall
Assumption: 1990's heavy rainfall >1910's heavy rainfall
In Patton City, days are categorized as having heavy rainfall (more than two inches), moderate rainfall (more than one inch, but no more than two inches), light rainfall (at least a trace, but no more than one inch), or no rainfall. In 1990, there were fewer days with light rainfall than in 1910 and fewer with moderate rainfall, yet total rainfall for the year was 20 percent higher in 1990 than in 1910.
If the statements above are true, then it is also possible that in Patton City
A. the number of days with heavy rainfall was lower in 1990 than in 1910 -->counter assumption
B. the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910 -->counter fact
C. the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910 -->counter fact
D. the total number of inches of rain that fell on days with moderate rainfall in 1990 was more than twice what it had been in 1910 -->best
E. the average amount of rainfall per month was lower in 1990 than in 1910 -->total of 1990> total of 1910 --> average 1990 > average 1910 -->can't be true
Fact:
1990's light rainfall days 1910's total rainfall
Assumption: 1990's heavy rainfall >1910's heavy rainfall
In Patton City, days are categorized as having heavy rainfall (more than two inches), moderate rainfall (more than one inch, but no more than two inches), light rainfall (at least a trace, but no more than one inch), or no rainfall. In 1990, there were fewer days with light rainfall than in 1910 and fewer with moderate rainfall, yet total rainfall for the year was 20 percent higher in 1990 than in 1910.
If the statements above are true, then it is also possible that in Patton City
A. the number of days with heavy rainfall was lower in 1990 than in 1910 -->counter assumption
B. the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910 -->counter fact
C. the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910 -->counter fact
D. the total number of inches of rain that fell on days with moderate rainfall in 1990 was more than twice what it had been in 1910 -->best
E. the average amount of rainfall per month was lower in 1990 than in 1910 -->total of 1990> total of 1910 --> average 1990 > average 1910 -->can't be true
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16 May 2009, 14:20
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gmatee
A, B, & C all contradicts given info.
E is impossible, if 1990's total is higher, the average is inevitably higher.
This leaves us with (D), while the total number of days w/ moderate rain decreased by some small amount, but the amount of moderate rain fall increased significantly, thus increasing total rain fall.
