NUR 6600: Sampling Exam Questions with Correct Answers

Sample Correct Answer a group selected for study from a population; used to make inferences about a population Census Correct Answer studies every member of a population The 2 questions researchers ask when evaluating a sample Correct Answer 1. Is the size adequate? 2. Is the sample biased? 3 major sources of sampling bias Correct Answer 1. cannot give every member of a population equal chance of being included (unless able to ID all members of a population of interest) 2. Samples of convenience (accidental samples) 3. Volunteerism How has population been defined? Correct Answer All members of a group If a researcher studies every member of a population, what type of study is s/he conducting? Correct Answer Census How can a researcher draw an unbiased sample? Correct Answer Give every member of a population equal opportunity to participate in the study Suppose a researcher drew a random sample from a population of college students but some of those selected refused to take part in the study. Are the students who participated in the study a "biased" or an "unbiased" sample of the population? Correct Answer Biased because not everyone sampled participated; volunteerism Suppose a psychologist has his or her clients participate in an experiment simply because they are readily accessible (not drawn at random from the population of interest). What type of sample is being used? Correct Answer Convenience sample If a researcher mails questionnaires to all clients of a social worker and 50% of them are completed and returned, is the sample "biased" or "unbiased"? Correct Answer Biased-volunteers Briefly describe one way a researcher can draw a simple random sample Correct Answer Names in a hat; randomize in Excel or website