Exam 1: Defining and Collecting Data

Which of the following sampling methods is a probability sample?

Most analysts focus on the cost of tuition as the way to measure the cost of a college education. But incidentals, such as textbook costs, are rarely considered. A researcher at Drummand University wishes to estimate the textbook costs of first-year students at Drummand. To do so, She monitored the textbook cost of 250 first-year students and found that their average textbook Cost was $600 per semester. Identify the sample in the study.