A researcher wishes to estimate the textbook costs of first-year students at Barry University.To do so,he recorded the textbook cost of 300 first-year students and found that their average textbook cost was $195 per semester.The variable of interest to the researcher is

A) textbook cost.
B) class rank.
C) number of students.
D) name of university.

Textbook Cost

Textbook cost refers to the expense associated with purchasing academic books required for coursework or study.

First-Year Students

Individuals in their initial year of study at an educational institution, often at a university or college.

Class Rank

A measure of how a student's performance compares to others in their group or grade level, often expressed as a percentile or as a rank.