Identify variables and classify them in terms of levels of measurement (nominal, ordinal or interval ratio), and whether dependant or independent.
Also identify the unit of measurement
A graduate student asks 5000 female students whether they have experienced any sexual harassment on campus. Each student is asked to estimate the frequency of these incidents as either "often, sometimes, rarely or never." The researcher also gathers data on age and major to see whether there is any connection between the two variables and frequency of sexual harassment.