REVIEW: Data Collection (Fast)

A student want administration to allow off-campus lunches so she has students that can drive answer the following question: “Should students that can drive be allowed to get lunch off campus so underclassmen have more room in the cafeteria?” What, potentially, is the main problem with this survey?

• Questionnaire bias

• Non-response bias

• Response bias

• Size bias

A newspaper asks readers to write in saying whether they agree with a statement about a local sports team. What, potentially, is the main problem with this survey?

• Too much variability in the opinions.

• Bias due to judgment sampling.

• Bias due to voluntary response.

• Size bias.

Which of these will produce a simple random sample from the given population?

• POPULATION: Students in a classroom of 36 students; METHOD: Randomly select 6 students, one from each of 6 rows.

• POPULATION: U.S. Honda Civic owners; METHOD: Select the first 1500 people who bought a Civic in the United States since January 1 of this year.

• POPULATION: Your statistics class; METHOD: Select all students whose phone number begins with a randomly chosen digit.

• POPULATION: All students at the school who use the lunch room; METHOD: Each student is given a number as they enter into the lunch room and then use a random number generator to pick 30 students.

Which of the following would be the best reason to conduct a simple random sample?

• Cheap and easy to do.

• Convenience.

• Reduce bias.

• Reduce variability.

Which of the following situations would NOT be appropriate to do a census?

• Determine the number of teenagers that smoke in a high school.

• Determine the number of sea bass that live in the Atlantic Ocean.

• Determine the number of U.S. Senators that are female.

• Determine the number of students from a small county going to college.

A teacher wants to know if using a calculator during class will help her students do better on the end of course test. She randomly selects three classes to use calculators every day and three classes to use calculators on tests and quizzes only. In the end she will compare results of the end of course exam. Determine if this is an observational study or an experiment and why.

• It is an observational study because no treatment was given.

• It is an observational study because she is only observing the class and not teaching any differently.

• It is an experiment because a treatment is given.

• It is an experiment because she will be comparing the results of the end of course exam.

A research company is going to conduct a survey to see if race and gender have different results from the survey. Which is the best way for the company to create a sample?

• Do a stratified sample then simple random sample within each strata.

• Do a simple random sample.

• Send out a survey by mail to everyone in the U.S. and have them mail it back.

• Pick every 10th person that walks by at different locations at the malls in a city.