Question 1
A scientist is hoping to compare the levels of DDT toxin found in three species of fish in a local river. He randomly samples 7 of each species to use in the analysis. For each fish, he measures the amount of DDT toxin present. The data is shown below:
Ideally he will be able to determine if a difference exists in the population of DDT toxins found in the three fish species. Identify the test statistic for the Kruskal-Wallis H-Test.
◦ H = 17.0
◦ H = 5.714
◦ H = 11.718
◦ H = 10.286
Question 2
A scientist is hoping to compare the levels of DDT toxin found in three species of fish in a local river. He randomly samples 7 of each species to use in the analysis. For each fish, he measures the amount of DDT toxin present. The data is shown below:
Ideally he will be able to determine if a difference exists in the population of DDT toxins found in the three fish species. Identify the rejection region that should be used to conduct the Kruskal-Wallis H-Test at α = 0.05.
◦ Reject H
0 if H > 9.48773
◦ Reject H
0 if H > 7.37776
◦ Reject H
0 if H > 5.99147
◦ Reject H
0 if H > 7.81473
An example of polymorphism: the two colour variations found in the orchid Dactylorhiza sambucina.
The calcaneus spur found on the male's hind limb is used to deliver venom.
Recently discovered species Tersicoccus phoenici under microscope
Levels of Prevention
Vaillant's Six Levels of Defense Mechanisms
Some threatened and endangered species