3. A university professor is interested in knowing the average GPA of a graduating class. The professor decided to record the GPA of only those students who were 20 2 Describing Data Graphically and Numerically in his/her class during the last semester before graduation. Using this information

(the data), the professor estimates the average GPA of the graduating class using the average of the GPAs he/she collected. Describe the following:

(a) Population of interest

(b) Sample collected by the professor

(c) The variable of interest