Question 1
A scientist is hoping to compare the mean levels of DDT toxin found in three species of fish in a local river. He randomly samples 50 of each species to use in the analysis. For each fish, he measures the amount of DDT toxin present. Ideally he will be able to rank the species based on the mean level of toxin found in each of the three species. How many factors are present in this study?
◦ 3
◦ 1
◦ 50
◦ 6
Question 2
A scientist is hoping to compare the mean levels of DDT toxin found in three species of fish in a local river. He randomly samples 50 of each species to use in the analysis. For each fish, he measures the amount of DDT toxin present. Ideally he will be able to rank the species based on the mean level of toxin found in each of the three species. Identify the treatments for this study.
◦ The amount of DDT in a fish
◦ The three fish species
◦ The scientist
◦ The 50 fish
Amsterdam Albatross - Adult in flight, showing dark plumage typical of the species.
Levels of Prevention
Ghost fish
Shapes of cells found in the brain.
Reserves can work for both fish and fishers
Darwin’s Notes on Transmutation of Species