Exam 2: Samples, Good and Bad

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 Which of these statements about a table of random digits is true?

The sports section of the East Mule Shoe Gazette runs a weekly question that readers can answer online. After the local university's football squad was beaten by its rival for the forty-second straight season, the question was "Do you think that the coach needs to go?" Of the 182 people who responded, 89 percent said Yes. When people say that the newspaper poll is biased, they mean that:

A local talk radio station conducts a poll to determine if its listeners favor or oppose the president's proposed actions on judicial appointments. To express their opinions, listeners are asked to call, email, or text-message the radio station. The poll results in 89.38 percent of the responders opposing the proposed judicial appointments. What type of sampling was used in this situation?

You want to take an SRS of 50 of the 816 students who live in a college dormitory. You label the students 001 to 816 in alphabetical order. In the table of random digits you read the entries Another valid choice of labels for the 816 students is

This type of sampling uses the idea of "drawing names out of a hat" to produce a sample of individuals.

Which of the following is not true of a simple random sample of size 1000 chosen from a population of size 4 million?

In a table of random digits,

You want to take an SRS of 50 of the 816 students who live in a college dormitory. You label the students 001 to 816 in alphabetical order. In the table of random digits you read the entries The first three students in your sample have labels

Every conceivable group of people of the required size has the same chance of being the selected sample when we use a

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 Another valid choice of labels for the 20 participants is

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. In this situation, your survey results will

A statistics recitation has 30 students. The presenter wants to call an SRS of five students from the recitation to ask where they use a computer for the online exercises. The presenter labels the students 01, 02, …, 30 and enters the table of random digits at this line: The SRS contains the students labeled:

An editorial writer for the East Mule Shoe Gazette wants to measure public support for a discontinued construction project that has left a city-block-size hole in the middle of the East Mule Shoe downtown area. So he uses his lunch hour one day to walk down the block adjacent to the project and ask the first 25 people who will talk to him about whether they support continuing the project. The newspaper asks readers to comment on its survey of local opinion. Readers say that:

A local talk radio station conducts a poll to determine if its listeners favor or oppose the president's proposed actions on judicial appointments. To express their opinions, listeners are asked to call, email, or text-message the radio station. The poll results in 89.38 percent of the responders opposing the proposed judicial appointments. In this situation, 89.38 percent is:

A(n) ____ is the subset of units that the experimenter actually measures.

You want to take an SRS of 50 of the 816 students who live in a college dormitory. You label the students 001 to 816 in alphabetical order. In the table of random digits you read the entries Which of these statements about the table of random digits is true?

A table of random numbers is used to select 30 students from a statistics class to rate a statistics video. The ratings that these students give are used to estimate the ratings that would be given if the entire class were asked to rate the video. This type of sample is

We select a sample in order to

When Ann Landers asked her readers to tell her "if your sex life has gone downhill after marriage," more than 100,000 people responded. This is an example of

A table of random numbers is used to select 25 students from a large class to rate a new single by Beyoncé. The ratings that these students give are used to estimate the ratings that would be given if the entire class were asked to rate the song. This type of sample is a: