Simple Random Sampling
Simple random sampling is a method for obtaining a study sample where every single member of the target population has an equal chance of being selected. While this approach is effective for ensuring a representative sample, it is often difficult or impossible to achieve in psychological research because populations are rarely defined clearly enough to give everyone an equal selection chance.
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Ch.2 Psychological Research - Psychology @ OpenStax
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Introduction to Psychology @ OpenStax Course
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OpenStax Psychology (2nd ed.) Textbook
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Research Methods in Psychology - 4th American Edition @ KPU
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Hypothesis
Independent Variable
Dependent Variable
Basic Two-Group Experimental Design
Random Assignment
A researcher wants to test if a new public speaking workshop reduces anxiety. They measure the anxiety levels of 50 volunteers before they participate in the workshop. A week after the workshop is completed, the researcher measures their anxiety levels again and finds that the average anxiety level has decreased. The researcher concludes the workshop is effective. What is the most significant flaw in this study's design?
Operational Definition
Simple Random Sampling
Confederate
Confederate in Research
Relationship Between Sample and Population
A team of researchers wants to understand the typical sleep habits of all adults in a country of 50 million people. Since they cannot survey every individual, which of the following approaches would be the most practical and scientifically sound first step for their investigation?
Random Sample
Example of a Sample: Talkativeness Study
Representative Sample
Inferential Statistics
Probability Sampling
Non-probability Sampling
Determinants of Survey Sample Size
Convenience Sampling
Survey Non-responder
Simple Random Sampling
Sampling Bias
Measures of Central Tendency
Which of the following best explains why a psychology researcher would choose to study a sample rather than an entire population?
A researcher is investigating the exercise habits of all 5,000 employees at a corporate headquarters. Arrange the steps of the research process in the correct logical order to show how a sample is used to understand the entire group.
A psychologist investigates the study habits of all first-year college students by surveying 200 first-year students at a single university. Match each part of this study to its functional role in the sampling process.
A researcher concludes that a sample of 1,000 volunteers recruited from a specialized tech-support website is a methodologically sound group for evaluating the computer literacy of all adults in a nation. This conclusion is justified because a sample size this large () automatically guarantees that the subset will closely resemble the entire group of interest.
Imagine you are a researcher designing a study to assess the prevalence of academic burnout among the 20,000 students in a statewide public university system. To construct a sampling plan that yields a highly representative subset () while ensuring that students from 'commuter', 'residential', and 'online-only' campuses are proportionally represented, which of the following sampling architectures should you create?
In psychological research, the primary goal of measuring variables in a sample is to generalize the findings back to the broader population of interest.
To conduct a study, researchers typically select a smaller subset of individuals from a broader group of interest. This smaller subset is referred to as a _____.
A psychology researcher wants to study the relationship between screen time and sleep quality among undergraduate students at a large university. Match each component of their study design to its corresponding concept in the sampling process.
A researcher measures academic anxiety in a group of 100 college students, intending to apply these results to all college students nationwide. In research methodology, the ultimate scientific goal of measuring these variables within a sample is to _____ the findings back to the broader population.
A researcher is planning a study on student stress. Evaluate and arrange the steps of the sampling and measurement process in the correct logical order, starting with the broadest scope and ending with the final application of the research findings.
In psychological research, what is a sample?
In psychological research, an investigator can confidently generalize the findings from a sample to the broader population of interest, regardless of whether the sample's characteristics resemble those of that population.
For each psychological research study, match the study's research description (which outlines the population of interest) with its corresponding sample (the actual subset of individuals from whom data was collected).
A researcher is studying academic anxiety levels within the population of 'all undergraduate psychology majors at KPU.' Analyze the following samples and arrange them in order from most representative (1) to least representative (3) of this target population.
A clinical psychologist conducts a study on stress levels among all working parents in a city, but collects data from a sample consisting entirely of high-income parents living in a single private community. In evaluating the generalizability of this study, the psychologist must conclude that this subset of parents is an ______ sample because its characteristics do not closely resemble those of the broader target population.
In scientific research, a sample refers to the entire, complete group of all individuals that a researcher wants to understand and draw conclusions about.
Which of the following statements best explains the scientific rationale for using a sample in psychological research?
A developmental psychologist wants to study the screen-time habits of all toddlers in a specific city. Since it is impossible to track every child, the researcher recruits and gathers data from 75 toddlers whose parents volunteered. In this study, the group of 75 toddlers represents the ______.
Analyze each of the following psychological research scenarios to evaluate the relationship between the defined population of interest and the obtained sample. Match each research scenario with its most accurate methodological evaluation.
Evaluating the generalizability of psychological research requires judging the scientific justification of a researcher's claims based on their sample and population. Evaluate the three research scenarios below and arrange them in order of their scientific generalizability, from the most justified generalization (first) to the least justified generalization (third).
In psychological research, what is a sample?
In psychological research, researchers measure variables within a sample with the intention of keeping their findings strictly limited to the individuals who directly participated in the study.
A researcher wants to study the effects of a new teaching method on the math performance of all 5th-grade students in a large school district. To do this, they randomly select three 5th-grade classrooms from one local school to participate in the study. Which of the following best analyzes the relationship between the sample and the population in this scenario?
In psychological research, why is it ideal for a sample to be representative of the population of interest?
A ______ is a smaller subset of individuals selected from a larger population of interest for the purpose of a research study.
A clinical psychologist evaluates a new therapy program for adolescents diagnosed with depression by testing it on 40 adolescent patients at a local clinic. In this research design, the 40 adolescent patients serve as the population of the study.
A research team wants to estimate the prevalence of generalized anxiety among all undergraduate students at a large university (the defined population). Evaluate the scientific justification for generalizing from the four distinct samples below. Match each sampling strategy to its most accurate methodological evaluation.
Sampling Frame
Cluster Sampling
Simple Random Sampling
Stratified Random Sampling
Which of the following is a key characteristic of probability sampling?
A researcher wants to study stress levels among all undergraduate students at a university. She posts flyers inviting volunteers and enrolls every student who responds. She reasons that because she can count exactly how many students signed up out of the total enrollment, she can calculate each person's probability of being in her sample, and therefore she is using probability sampling.
A psychologist is conducting a study on the relationship between sleep quality and academic performance. They intend to use a probability sampling method to ensure every student at their university has a known, mathematically specified chance of being included. Arrange the following steps in the correct order to execute this sampling plan.
A researcher is evaluating different sampling strategies for a study on campus life. Match each specific sampling scenario with the logical reason it either meets or fails the mathematical requirements of probability sampling.
A psychologist evaluates a colleague's study on social anxiety and concludes that the sampling method fails to meet the criteria for probability sampling. This judgment is justified because the colleague cannot mathematically specify the exact ________ that each member of the defined population will be selected.
Suppose you are designing a new study to investigate the prevalence of social anxiety among the 12,000 residents of a specific rural county. To ensure the results are representative and the probability of selection for each resident is mathematically specified, which of the following procedures should you create and implement?
A researcher can successfully perform probability sampling without defining the target population beforehand, because the exact selection probabilities can be calculated after the data collection is complete.
A research team plans a new study. Match each research goal or step with the correct action required to satisfy the conditions of probability sampling.
An investigator analyzing a survey methodology determines that the design cannot qualify as probability sampling because the researchers are unable to mathematically specify the exact _____ that each member of the defined population will be selected.
Order the steps of executing and evaluating a survey study using probability sampling, starting from the necessary prerequisite to the final population estimate.
Describe the defining characteristic of probability sampling and explain the essential prerequisite required before a researcher can begin this type of sampling.
Explain how the research team's request for the comprehensive list demonstrates their understanding of the fundamental requirements of probability sampling.
A political scientist is designing a survey and wants to make highly accurate estimates about the voting intentions of a town's residents. If the researcher intends to use probability sampling, what specific property must their sampling method possess regarding the town's residents?
Stratified Random Sampling
Simple Random Sampling
1936 Literary Digest Straw Poll
Which of the following provides the best definition of a sampling frame?
A researcher is planning several different studies. Match each group of interest with the specific source list that would serve as the most appropriate sampling frame for selecting participants.
A researcher discovers that their sampling frame—a list of residential landline phone numbers—excludes approximately 25% of the local community who only use cell phones. If the researcher increases their random sample size from 400 to 800 people using this same list, they will effectively eliminate the bias introduced by the incomplete list.
A researcher is designing a study to evaluate the job satisfaction of all licensed clinical psychologists currently practicing in a specific state. To ensure the study uses a random selection process where every professional in that group has a chance of being included, the researcher must identify an appropriate sampling frame. Rank the following potential sources from the most representative sampling frame (1) to the least representative sampling frame (4).
Establishing an accurate sampling frame is a necessary prerequisite for conducting most forms of probability sampling.
Which of the following best describes the functional role of a sampling frame in the research process?
When a researcher uses a local hospital's patient admission records to select participants for a clinical study, that comprehensive list serves as the _____.
A researcher is planning studies for different target populations. Match each specified population with the most appropriate source list to establish its sampling frame.
A researcher is unable to obtain a comprehensive list of all members of their target population. Because establishing an accurate sampling frame is a necessary prerequisite for conducting most forms of _____, they cannot use random selection techniques.
Order the steps a researcher must take to implement a probability sampling design, starting from the initial conceptual stage to the selection of respondents.
Learn After
Example of Simple Random Sampling: Pollster
Representative Sample
Why is simple random sampling often difficult or impossible to achieve in psychological research?
A psychology researcher wants to study stress levels among all undergraduate students at a large university. She posts a survey link on the university's social media page and collects responses from the first 200 students who volunteer to participate. This procedure qualifies as simple random sampling because any student at the university could have seen the post and chosen to respond.
A researcher wants to select a group of 50 participants from a university directory of 1,000 students using simple random sampling. Arrange the steps of this procedure in the correct chronological order.
To implement a sampling method where every member of a target group has an equal selection chance, a researcher must manage several distinct components. Match each component to the analytical role it plays in ensuring the method is executed correctly.
In simple random sampling, every individual member of the target population has an equal chance of being selected for the study.
A researcher defines their target population as 'all working parents in a city.' If the researcher only selects participants from a list provided by one specific daycare center, which aspect of simple random sampling is being violated?
When critiquing the methodology of a study claiming to use simple random sampling for 'all adults with depression in North America,' a researcher would conclude the claim is likely invalid. This judgment is based on the fact that without a complete sampling frame, it is impossible to ensure that every individual in that population has a(n) _____ chance of being selected.
A psychology instructor wants to demonstrate how sampling feasibility changes depending on how populations are defined and accessed. Match each research scenario or component to the corresponding practical characteristic of simple random sampling.
When analyzing the limitations of psychological research designs, a methodologist points out that simple random sampling is rarely achieved. This is because, unlike political polling where databases of registered voters are available, psychological populations are rarely defined _____ enough to give everyone an equal chance of selection.
A research team is evaluating a proposed study to determine if it successfully implements simple random sampling. Order the steps they should take to establish and evaluate the sampling process, starting from population definition to final evaluation.
What is the defining characteristic of a simple random sample?
To achieve a true simple random sample of all college students in the United States, a researcher would need access to a complete and accurate list of every currently enrolled college student in the country.
A cognitive psychologist wants to draw a simple random sample of 100 registered voters in a small town to study their decision-making processes. Arrange the steps she must take to properly execute this sampling method.
A clinical psychologist wants to study the burnout rates of all registered nurses in Texas. She obtains a complete, official list of active nursing licenses from the state medical board and uses a random number generator to select 200 names from that list to receive her assessment. Analyze this study design and match each component to the correct methodological concept.
A research team submits a manuscript claiming they used simple random sampling to study the mental health of 'all currently enrolled university students in Canada.' To achieve this, they acquired complete student rosters from three of the largest universities in the country and used a computer algorithm to randomly select 1,000 students from those lists. As a peer reviewer, how should you evaluate their methodological claim?
To ensure a representative sample, a researcher might use ____ random sampling, which is a method where every single member of the target population has an equal chance of being selected.
Which statement best describes the primary practical limitation of using simple random sampling in psychological research?
A clinical psychologist wants to study the prevalence of sleep disorders among patients at a specific psychiatric clinic. She obtains the clinic's complete database of active patients, assigns each patient a unique ID, and uses a random number generator to select 100 patients to contact. This procedure is a successful application of simple random sampling.
A developmental psychologist is investigating the early play behaviors of 'all neurodivergent toddlers in North America.' To recruit her sample, she acquires the complete mailing list of a massive, multinational autism advocacy organization and uses a computer algorithm to randomly select 300 families to participate. When analyzing the structural components of this study's design, why does this approach fail to achieve simple random sampling?
As a peer reviewer, evaluate the methodological claims of the following studies. Match each proposed study design to the correct evaluation of whether it successfully achieved simple random sampling.