Exam 5: Data Collection and Sampling

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

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?

Which of the following statements is true regarding the design of a good survey?

A pharmaceutical company interested in measuring how often physicians prescribe a certain drug has selected a simple random sample from each of two groups: M.D.(Medical Doctors) and D.O.(Osteopaths).What is this type of sampling called?

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

In a self-administered survey, the individuals in the sample are typically contacted by ____________________.

A senator wants to estimate the mean age of registered voters in her state.Unfortunately, she does not have a complete list of households in her state.Describe a sampling plan that would be suitable for her purposes.

Which of the following types of samples should not be used to make good statistical inferences from a sample to a population?

Self-selected samples have no bias because they are chosen by the people themselves.

The response rate of a survey is the proportion of all people who were selected but did not complete the survey.

Which of the following data collection methods is not observational?

In a(n) ____________________ study, there is no attempt to control factors that might influence the variable of interest.

A(n) ____________________ sample is obtained by separating the population into groups and taking a simple random sample from each group.

____________________ sampling is particularly useful when it is difficult or costly to develop a complete list of the population members.

A nonsampling error can be caused by the wording of a question.

When every possible sample with the same number of observations is equally likely to be chosen, the result is called a:

A self-selected sample is the group of individuals who were randomly selected to be in the sample, then agreed to participate in the study.

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

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 sampling error can be reduced by taking a larger sample size.