A student is conducting research on the study habits of fellow students at a college. Which variable of the study is quantitative?

Type of residence refers to categorical data, such as whether a student lives on-campus, off-campus, or at home. These categories do not have numerical values and cannot be quantified, thus disqualifying them as a quantitative variable.

Major area of study is also a categorical variable, representing different fields like Biology, Engineering, or History. While it signifies a student's focus, it lacks numerical representation and cannot be measured in a way that allows for quantitative analysis.

Primary time of day to study is a qualitative variable that indicates when students prefer to study, such as morning, afternoon, or evening. Although it can be categorized, it does not provide a numerical value for measurement, thus failing to meet the criteria for a quantitative variable.