Suppose a researcher is interested in determining the number of classes taken by students at the University of Mary. To determine this, he obtains a list of all students from the registrar, alphabetizes them, and selects every 100th student to participate in his survey.

a. Is this an observational study or an experiment? Why?

b. What sampling method is being used by the researcher here?

c. The variable of interest is the number of classes taken by the student. Is this qualitative - discrete, or quantitative-continuous? Why?

d. The variable of interest is the number of classes taken by the students. Describe the level of data - is it NOMINAL, ORDINAL, INTERVAL, OR RATIO? Why

Please round your answers to four decimal places.