Identify all variables in these research projects and classify them by their level of measurement. Which variables are independent and which are dependent?
A graduate student asks 500 female students if 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 if there is any connection between these variables and the frequency of sexual harassment.