Student samples The university administration of Exercise 1 is considering a variety of ways to sample students for a survey. For each of these proposed survey designs, identify the problem. a)...

Student samples The university administration of Exercise 1 is considering a variety of ways to sample students for a survey. For each of these proposed survey designs, identify the problem.

a) Publish an advertisement inviting students to visit a website and answer questions.

b) Set up a table in the student union and ask students to stop and answer a survey.