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?

The ____________________ rate is the proportion of people in the sample who completed the survey.

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

Pollsters want to know what percentage of all registered voters in Missoula, Montana, intend to vote in the next election. They visit with 350 people at the downtown shopping mall during one afternoon and ask each person whether or not they intend to vote. Are the target population and the sampled population the same in this case? Explain.

Which of the following must be avoided in designing a survey?

Is it possible for a sample to yield better results than a census, from a practical standpoint? Explain.

Give an example of a poll that involves a self-selected sample.

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

List one advantage and one disadvantage of a telephone interview as a method of data collection.

Which of the following data collection methods is not observational?

Cluster samples typically cost less but they also increase sampling error.

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.

Which of the following causes sampling error?

____________________ error results from the failure to collect data from all subjects in the sample.

A question on a survey that was not answered is an example of an open-ended question.

Excluding some members of the target population results in ____________________ bias.

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

A person receives a mail survey and shreds it without opening it. This causes nonresponse error.

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?

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