Marine biologists are concerned that pollution from a nearby factory has affected the health of local trout. Which of the following is most likely to be the population of interest?

Which of the following variables is most likely to be classified as nominal?

Which of the following variables is most likely to be used as quantitative?

A 2014 Gallup poll asked, "In politics, as of today, do you consider yourself a Republican, a Democrat, or an Independent?" The possible responses were "Democrat," "Republican," "Independent," "Other," and "No Response." What kind of variable is the response?

Identify the kind of variable in this situation:

length of time a football play lasts