More on different sampling methods

At OSU, the College of Arts and Sciences houses a total of 38 different academic departments and schools. The College of Arts and Sciences would like to survey its undergraduate students in order to learn more about their experiences with academic advising. There are different ways in which a sample of undergraduate students could be selected. Below, Questions 7 through 10 each describe a different way in which a sample of students could be obtained. For each description, indicate whether the resulting sample would be a simple random sample, a voluntary response sample, a stratified random sample, or a systematic sample.

1. An alphabetized list of all undergraduate students in the College of Arts and Sciences is obtained, and a survey is sent to every 50th student on the list.

2. From each academic department and school, a random sample of students is selected to be surveyed.

3. An ad appears in a monthly electronic undergraduate College of Arts and Sciences newsletter, and students are invited to respond to the ad if they would like to answer questions about their undergraduate advising experiences.

4. An alphabetized list of all undergraduate students in the College of Arts and Sciences is obtained, and each student on the list is given a unique number. A random number generator (such as Random.org) is then used to select 500 numbers, and the students whose names correspond to those numbers are surveyed.

5. If there was a way for the College of Arts and Sciences to include the entire population of its undergraduate students in their sample, they would have what is called a ___________________________.