Exam 5: Selecting Research Participants.

A snack food company is developing a new flavor for crackers and asks customers to text their preference between two possibilities.What kind of sampling is being used?

A researcher would like to select a sample of 50 people so that five different age groups are equally represented in the sample.Assuming that the researcher does not know the entire list of people in the population,which sampling technique should be used?

Stratified random sampling is used instead of simple random sampling when a researcher wants to ensure that the sample has specified characteristics.

A cluster sample usually does not qualify as a true random sample because ____.

It is always necessary to have at least 25-30 participants in a study.

Psychology majors at the state college consist of 40% males and 60% females.The psychology department is conducting a survey of its majors and obtains a sample by randomly selecting students so there will 20 males and 30 females from the list of psychology majors.What kind of sampling is used in this example?

A researcher recruits participants for an experiment by posting an announcement in the psychology department asking for volunteers.What kind of sampling is being used?

One characteristic of random sampling with replacement is that it ____.

Although it is possible to obtain a sample with characteristics that are very different from the population through random sampling,it is more likely that a nonrepresentative sample is the result of ____.

If the individuals in a sample have characteristics that are noticeably different from the individuals in the population,then the sample is said to be ____.

One criticism of a stratified random sample is that ____.

Explain why you are more likely to obtain a representative sample with proportionate stratified random sampling than with either stratified random sampling or simple random sampling.

A systematic sample does not qualify as a true random sample because ____.

The most commonly used sampling method in psychological research is probably ____ sampling.

When the goal of a research study is to describe and compare different subgroups in a known population,the best strategy is to use proportionate stratified random sampling.

A large sample is generally more representative than a small sample.

A process that produces one outcome from a set of possible outcomes,produces an unpredictable outcome,and guarantees that each of the possible outcomes equally likely is said to be ____.

A sample consists of 25 freshmen,25 sophomores,25 juniors,and 25 seniors from a local high school that has an equal number of students in each class.If the sample was obtained using a list of all the students in the high school,it is probably an example of ____ sampling.If the sample was obtained without a list of students,it is likely an example of ____ sampling.

If each person in a large group has an equal chance of being included in an experiment,then the researcher is using ____ sampling.

A researcher would like to examine the political attitudes for students at a local university.The researcher will evaluate a sample of 200 students but would like to be sure that the ages and genders of individuals in the sample accurately represent the ages and genders for the entire student body at the university.What would be the best sampling method for the researcher to use?