On This Page:ToggleNomothetic ApproachIdiographic ApproachConclusion On This Page:Toggle On This Page: The nomothetic approach in psychology seeks general principles and patterns applicable to groups, while the idiographic approach focuses on understanding individuals in their unique context.Nomothetic uses quantitative methods, while idiographic uses qualitative methods for studying human behavior and psychological processes.Nomothetic ApproachThe nomothetic approach in psychology focuses on general principles and laws that apply to groups of individuals.It seeks to identify and understand universal patterns, traits, and characteristics that can be generalized across people, using quantitative methods and statistical analysis to conclude human behavior....

Observer bias is a type of experimenter bias that occurs when a researcher’s expectations, perspectives, opinions, or prejudices impact the results of an experiment. This type of research bias is also called detection bias or ascertainment bias. This typically occurs when a researcher is aware of the purpose and hypotheses of a study and holds expectations about what will happen. If a researcher is trying to find a particular result tosupport the hypothesisof the study or has a predetermined idea of what the results should be, they will have the incentive to twist the data to make them more in line with their predictions....

On This Page:ToggleWhen to UseAdvantagesLimitationsExamplesFAQs On This Page:Toggle On This Page: A panel study is a type oflongitudinal researchwhere data is collected from the same individuals, known as a panel, repeatedly over a period of time to make inferences about trends, patterns, and causal relationships in that population. When to Use Panel studies measure people’s behaviors over time, specifically their opinions, feelings, emotions, and thoughts. Researchers in panel studies collect information on the same individuals and gather data repeatedly at different points during the study....

On This Page:ToggleHow Does it Work?Experiment Pilot StudyQuestionnaire Pilot StudyAdvantagesLimitationsExamples On This Page:Toggle On This Page: A pilot study, also known as a feasibility study, is a small-scale preliminary study conducted before the main research to check the feasibility or improve the research design. Pilot studies can be very important before conducting a full-scale research project, helping design the research methods and protocol. How Does it Work? Pilot studies are a fundamental stage of the research process....

On This Page:ToggleHow it WorksAdvantagesLimitationsExamplesFAQsA prospective study, sometimes called a prospective cohort study, is a type oflongitudinal studywhere researchers will follow and observe a group of subjects over a period of time to gather information and record the development of outcomes.The participants in a prospective study are selected based on specific criteria and are often free from the outcome of interest at the beginning of the study. Data on exposures and potential confounding factors are collected at regular intervals throughout the study period....

On This Page:ToggleTechniquesApplicationsHow to UseAdvantagesLimitationsExample SituationQuota Sampling vs StratifiedKey Terms On This Page:Toggle On This Page: Quota sampling is a non-probabilitysampling methodwhere the researcher selects participants based on specific characteristics, ensuring they represent certain attributes in proportion to their prevalence in the population. It’s like stratified sampling but without random selection within each stratum. Non-probability sampling means that researchers subjectively choose the sample instead of random selection, so not all population members have an equal chance of participating....

In psychology, random assignment refers to the practice of allocating participants to different experimental groups in a study in a completely unbiased way, ensuring each participant has an equal chance of being assigned to any group.In experimental research, random assignment, or random placement, organizes participants from your sample into different groups using randomization.Random assignment uses chance procedures to ensure that each participant has an equal opportunity of being assigned to either a control or experimental group....

On This Page:ToggleHow to UseAdvantagesLimitationsExamplesFAQsA retrospective study, sometimes called a historical cohort study, is a type oflongitudinal studyin which researchers look back to a certain point to analyze a particular group of subjects who have already experienced an outcome of interest.In a retrospective cohort study, the researcher identifies a group of individuals who have been exposed to a certain factor and a group who have not been exposed (the cohorts), and then looks back in time to see how the rate of a certain outcome (like the development of a disease) differs between the two groups....

On This Page:ToggleExampleTypesCausesPrevention On This Page:Toggle On This Page: Sampling bias occurs when a sample does not accurately represent the population being studied. This can happen when there are systematic errors in the sampling process, leading to over-representation or under-representation of certain groups within the sample. Sampling bias results in biased samples of a population where all individuals were not equally likely to have been selected and thus do not accurately represent the entire group....

On This Page:ToggleMethodAdvantagesLimitationsOther techniques On This Page:Toggle On This Page: Simple random sampling is atechniquein which each member of a population has an equal chance of being chosen through an unbiased selection method. Each subject in the sample is given a number, and then the sample is chosen randomly. This method is considered “simple” because it’s straightforward and implements a random process (like flipping a coin or drawing numbers from a hat) to select the sample....

On This Page:ToggleTechniquesMethodEthicsExample SituationsAdvantagesLimitationsKey Terms On This Page:Toggle On This Page: Snowball sampling, also known as chain-referral sampling, is a non-probability sampling method where currently enrolled research participants help recruit future subjects for a study.Snowball sampling is often used inqualitative researchwhen the population is hard-to-reach or hidden. It’s particularly useful when studying sensitive topics or when the members of a population are difficult to locate. Snowball sampling, also known as chain-referral sampling, is a non-probability sampling method where currently enrolled research participants help recruit future subjects for a study....

On This Page:ToggleLarge vs. Small Standard ErrorFormulaHow to CalculateExample On This Page:Toggle On This Page: When you take samples from a population and calculate the means of the samples, these means will be arranged into a distribution around the true population mean. The standard deviation of thisdistribution of samplingmeans is known as the standard error. Large vs. Small Standard Error Standard error estimates how accurately the mean of any given sample represents the true mean of the population....

On This Page:ToggleApplicationsTechniqueExample SituationsAdvantagesLimitationsCluster Sampling vs. StratifiedQuota vs. StratifiedKey Terms On This Page:Toggle On This Page: Stratified random sampling is amethod of selecting a samplein which researchers first divide a population into smaller subgroups, or strata, based on shared characteristics of the members and then randomly select among each stratum to form the final sample.These shared characteristics can include gender, age, sex, race, education level, or income.Stratified sampling is a method of sampling that involves dividing a population into homogeneous subgroups or ‘strata’, and then randomly selecting individuals from each group for study....

On This Page:ToggleParadigm ShiftKuhn’s Phases of ScienceCritical Evaluation On This Page:Toggle On This Page: Summary Paradigm Shift A paradigm is a basic framework of assumptions, principals and methods from which the members of the community work. It is a set of norms that tell scientists how to think and behave, and although there are rival schools of thought in science, there is still a single paradigm that all scientists accept uncritically....

On This Page:ToggleMake an Observation (Theory Construction)Ask a QuestionForm a HypothesisRun an Experiment (Gather Data)Analyze the Data and Draw ConclusionsShare Your ResultsRepeat the Scientific Method (Iteration) On This Page:Toggle On This Page: Science is not just knowledge. It is also a method for obtaining knowledge. Scientific understanding is organized into theories. It involves careful observation, asking questions, formulating hypotheses, experimental testing, and refining hypotheses based on experimental findings. How it is Used The scientific method can be applied broadly in science across many different fields, such as chemistry, physics, geology, and psychology....