Exam 2: Samples, Good and Bad

For a class project, you want to survey students at your school for their opinions about the importance of studying. You go to the campus library and survey two hundred students as they are leaving the library. What type of sampling was used in this situation?

For a sample to be a simple random sample of size n,

Suppose you want to take a simple random sample of size 6 from the 20 participants in your Zumba exercise class. You label the students 01 to 20 in alphabetical order by last name. In the table of random digits, you read the entries The six participants in your selected sample have labels

Voluntary response sampling occurs when

The mayor's office wants to know how people in the city feel about the condition of the city's roads. They place an announcement in the newspaper asking residents to email their opinions to the mayor's office. Five hundred people send emails, and about 84% of the responses indicate displeasure with the condition of the city's roads.

The website randomizer.org is used to select 30 students without repetition from a statistics class with 135 members to rate a statistics video. These 30 students are:

A teacher writes the names of her 30 students on small pieces of paper and places them into a box. She then draws out five names to select students to participate in a survey. These five students are

Voluntary response polls almost always suffer from

The president of a university sends surveys to and receives answers from all 21 board members to better understand their positions about upcoming budget issues. These 21 board members are

Bias in a sampling method is