A university has 30,000 undergraduate and 10,000 graduate students. A survey of student opinion concerning health care benefits for domestic partners of students selects 300 of the 30,000 undergraduate students at random and then separately selects 100 of the 10,000 graduate students at random. The 400 students chosen make up the sample. Which of the following statements correctly explains why this sampling method gives each student an equal chance to be chosen?

A university has 30,000 undergraduate and 10,000 graduate students. A survey of student opinion concerning health care benefits for domestic partners of students selects 300 of the 30,000 undergraduate students at random and then separately selects 100 of the 10,000 graduate students at random. The 400 students chosen make up the sample. Which of the following statements correctly explains why this sampling method gives each student an equal chance to be chosen?

A university has 30,000 undergraduate and 10,000 graduate students. A survey of student opinion concerning health care benefits for domestic partners of students selects 300 of the 30,000 undergraduate students at random and then separately selects 100 of the 10,000 graduate students at random. The 400 students chosen make up the sample.
Which of the following statements correctly explains why this sampling method gives each student an equal chance to be chosen?



A. Every undergraduate student has a 75% chance of being selected and every graduate student has a 25% chance of being selected, which is proportional to the makeup of the student body.
B. Any student has a 50% chance of being chosen, since the student is either selected or not.
C. Any student, undergraduate or graduate, has a 1 in 100 chance of being selected.


Answer: C. Any student, undergraduate or graduate, has a 1 in 100 chance of being selected.


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