A Scientist Is Hoping to Compare the Mean Levels of DDT

Multiple Choice

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?

A) 50
B) 3
C) 1
D) 6