A researcher looking for gender differences in 3-year- olds observes a preschool class and records how many minutes children of each gender play with dolls. She then compares the two sets of numbers. What type of descriptive research is she conducting?

. Which of the following questions is best investigated by means of a survey?

A person displays a set of rare behaviors that psychologists had not known about previously, because nobody had ever shown them before. The best strategy to investigate the nature of those behaviors is

 Which of the following is most important when conducting survey research?

 The purpose of random assignment is to

Which of the following is a measure of variation?

Which statistical measure of central tendency is most affected by extreme scores?

What must a researcher do to fulfill the ethical principle

of informed consent?

Which ethical principle requires that at the end of the study participants be told about the true purpose of the research?

Which method should a psychology researcher use if she is interested in testing whether a specific reward in a classroom situation causes students to behave better?

Clinical researchers are interested in gaining insight into the causes of abnormal behavior. One way that they do this is to delve deeply into the histories of patients with a common diagnosis, interviewing family, friends, teachers, therapists, physicians, babysitters, and others who can provide rich details about the patients’ lives. Then, researchers try to see if there are any common themes in the information gathered. What research method does this strategy represent?

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Ten participants in a treatment group were asked to rate their feelings of self worth on a scale of one to ten, with a value of ten indicating a very positive feeling of self-worth. The data for the participants are above.

What is the mode for these data?