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Exam 7: Sampling: Estimating the Frequency of Behaviors and Beliefs

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Question 21

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When you are interrogating the external validity of a sample,which is the most important question to ask?

A) How many people are in the sample?
B) How was the sample collected?
C) How were the participants measured?
D) How many people are in the population?

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Question 22

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Professor Kramer has decided to measure how happy his students are with his teaching this semester.He is teaching two classes this semester-Psychology and Law and Introduction to Neuroscience.He gives his students a survey. -In the above scenario,Dr.Kramer needs to avoid which of the following if he hopes to avoid having a biased sample?

A) Sampling only those students who come to class frequently
B) Sampling only those students who volunteer to complete the survey
C) Sampling only those students who sign the consent form
D) Sampling only those students who finish the survey

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Question 23

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Convenience sampling relies on which of the following?

For his research methods class project,Hiro is studying the effect of pet ownership on stress levels.Although a lot of research has been done on dog and cat owners,not much is known about other pets,so Hiro decides to study hamster owners.Which of the following would demonstrate a purposive sampling technique?

Dr.Parrett is a sports psychologist for a large Southern university.The provost and chancellor have asked him to examine the relationship between athletic performance and academic stress at the university.For example,is it the case that the most talented athletes experience the greatest concern over their grades? The provost and chancellor have made it clear to Dr.Parrett that they want a large amount of external validity in the study.He has valid and reliable measures of both athletic performance and academic stress.He knows that he does not have the time or the money to study the entire population of interest. -Imagine that Dr.Parrett wants to use a nonrepresentative sampling technique.Name the three types of nonprobability sampling and explain how each one could be used by Dr.Parrett.

Professor Kramer has decided to measure how happy his students are with his teaching this semester.He is teaching two classes this semester-Psychology and Law and Introduction to Neuroscience.He gives his students a survey. -In the above scenario,43 of 50 Introduction to Neuroscience students and 46 of 48 Psychology and Law students complete the survey.Based on this information,which of the following can Dr.Kramer say?

Which of the following statements is true of random assignment and random sampling?

Professor Kramer has decided to measure how happy his students are with his teaching this semester.He is teaching two classes this semester-Psychology and Law and Introduction to Neuroscience.He gives his students a survey. -In the above scenario,what is Dr.Kramer's likely population of interest?

Which of the following is true of sample size?

What is the difference between random sampling and random assignment?

Dr.Cyril conducts a simple random sample of 500 men who became fathers for the first time in the last year.He finds that 23% of them report being unsure of their ability to be good fathers,plus or minus 4%.What does this mean?

Dr.Parrett is a sports psychologist for a large Southern university.The provost and chancellor have asked him to examine the relationship between athletic performance and academic stress at the university.For example,is it the case that the most talented athletes experience the greatest concern over their grades? The provost and chancellor have made it clear to Dr.Parrett that they want a large amount of external validity in the study.He has valid and reliable measures of both athletic performance and academic stress.He knows that he does not have the time or the money to study the entire population of interest. -What is the population of interest in Dr.Parrett's study? Will he be collecting a sample or conducting a census? Why does he need to be concerned with external validity/representativeness?

If researchers measure every tenth member of a population,they have:

A biased sample consists of too many ________ cases.

Online surveys commonly suffer from which of the following?

Which of the following is true of a nonrepresentative sample in a research claim?

Dr.Dowling is a clinical psychologist who is interested in the link between mental illness and criminal activity.She gets IRB permission to study patients at all five inpatient/residential mental health facilities in her state.There are 4,307 patients currently living in these facilities.She asks patients whether they have ever been arrested for a crime and whether they have ever been convicted of a crime.She collects a sample size of 1,369.She finds that 27% (+/- 3%)report having been arrested for a crime but that only 13% (+/- 3%)have been convicted of a crime. -Name two populations of interest that Dr.Dowling could reasonably generalize her findings to.State which of these two populations her findings would be more generalizable to and explain why that is the case.

Professor Kramer has decided to measure how happy his students are with his teaching this semester.He is teaching two classes this semester-Psychology and Law and Introduction to Neuroscience.He gives his students a survey. -In the above scenario,Dr.Kramer could reasonably use his sample to say something about which of the following populations of interest EXCEPT?

How are quota sampling and stratified random sampling similar?

A sample is always ________ a population.