Exam 5: Data Collection and Sampling

To give away a door prize,the hostess of a Tupperware party put each person's name into a hat,mixed them up,and selected one name.What sampling method was used?

Smoking and Heart Attacks A medical researcher is interested in investigating the relationship between smoking and heart attacks -{Smoking and Heart Attacks Narrative} Briefly describe how the researcher might design an observational study to investigate the relationship between smoking and heart attacks

A simple random sample is chosen in such a fashion that every possible subset of the same size has an equal chance of being selected.

Which method of data collection is involved when a researcher counts and records the number of students wearing backpacks on campus in a given day?

The personnel director at a large company studied the eating habits of the company's employees.The director watched and recorded whether each employee brought his/her own lunch to work,ate at the company cafeteria,or went out to lunch.What method of data collection was used here?

A regular feature in many newspapers asks readers to respond via e-mail to a survey question.The percentages of yes and no responses are usually reported the following day.Should we ignore the results of these surveys? Explain.

Which of the following is an example of a nonsampling error?

____________________ error refers to differences between the sample and the population.

Describe the difference between an observational study and an experimental study.

The larger the sample size is,the more accurate we can expect our sample estimates to be.

Which of the following situations lends itself to cluster samples?

____________________ error is due to mistakes made in the acquisition of data.

Selection bias occurs when researchers select biased questions to include on a survey.

In a(n)____________________ study,individuals are randomly assigned to different treatments and the results are compared.

A cluster sample occurs when you randomly select groups,and for each group selected,you sample every single member of that group.

What is meant by a self-selected sample? Why are self-selected samples not desirable?

Gender,occupation,and age are all examples of ____________________ variables.

Two types of interviews that are used to collect data are ____________________ interviews and ____________________ interviews.

A researcher conducts a study where she divides subjects into two groups,gives each group a certain treatment,and records their responses.What type of data collection is being used here?

The target population is the population about which we want to draw inferences and conclusions,while the sampled population is the actual population from which the sample has been taken.