The department of zoology at the Virginia Polytechnic Institute and State University carried out a study to determine if there is a significant difference in the density of organisms in two different stations located in Cedar Run, a secondary river that is located in the river basin. Roanoke. Drainage from a sewage treatment plant and overflow from the Federal Mogul Corporation sedimentation pond enter the flow near the source of the river. The following data give the density measurements, in numbers of organisms per square meter, at the two different collecting stations. Number of
The department of zoology at the Virginia Polytechnic Institute and State University carried out a study to determine if there is a significant difference in the density of organisms in two different stations located in Cedar Run, a secondary river that is located in the river basin. Roanoke. Drainage from a sewage treatment plant and overflow from the Federal Mogul Corporation sedimentation pond enter the flow near the source of the river. The following data give the density measurements, in numbers of organisms per square meter, at the two different collecting stations.
Number of organisms per square meter
|
Station 1 |
Station 2 |
|
5030 |
2800 |
|
13700 |
4670 |
|
10730 |
6890 |
|
11400 |
7720 |
|
860 |
7030 |
|
2200 |
7330 |
|
4250 |
2810 |
|
15040 |
1330 |
|
4980 |
3320 |
|
11910 |
1230 |
|
8130 |
2130 |
|
26850 |
2190 |
|
17660 |
|
|
22800 |
|
|
1130 |
|
|
1690 |
|
With a significance level of 0.05, can we conclude that the densities are the same in the two stations? Assume that the observations come from normal populations with different variances. The degrees of freedom, the statistic, and the power of the test are:
Select one:
a. 26; 1,645; 0.12
b. 20 ; 2.76 ; 0.012
c. 19 ; 1.645 ; 0.012
d. 19; 2.76 ; 0.012
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