Independent Variable
Independent Variable - Related Videos
05:08
Manipulating an Independent Variable through Embodiment
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2023
Source: Laboratories of Gary Lewandowski, Dave Strohmetz, and Natalie Ciarocco—Monmouth University In any experiment, the researcher attempts to manipulate participants in one group to have different thoughts, experiences, or feelings than the other groups in the study. Some manipulations are overt, while others can be quite subtle. Embodiment is a growing research area focused on the theory that subtle physical experiences can unconsciously influence a person’s thoughts. For example if a...
01:21
Introduction to Test of Independence
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2025
In statistics, the term independence means that one can directly obtain the probability of any event involving both variables by multiplying their individual probabilities. Tests of independence are chi-square tests involving the use of a contingency table of observed (data) values. The test statistic for a test of independence is similar to that of a goodness-of-fit test: where: O = observed values E = expected values (which should be at least 5) A test of independence determines whether...
01:16
Hypothesis Test for Test of Independence
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2023
The test of independence is a chi-square-based test used to determine whether two variables or factors are independent or dependent. This hypothesis test is used to examine the independence of the variables. One can construct two qualitative survey questions or experiments based on the variables in a contingency table. The goal is to see if the two variables are unrelated (independent) or related (dependent). The null and alternative hypotheses for this test are: H0: The two variables (factors)...
02:36
Law of Independent Assortment
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2026
While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.Let’s think of two homozygous...
01:18
Independent and Dependent Sources
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2024
In electrical circuits, sources play a crucial role in providing power for the operation of the circuit. These sources can be broadly categorized into two types: independent and dependent. Independent voltage or current sources supply a fixed amount of voltage or current, respectively, which is unaffected by other elements within the circuit. These are represented using specific symbols. Independent voltage sources are symbolized with polarities (+ and -), indicating the direction of the...
FAQs
Researchers operationalize it by specifying the exact conditions or levels that participants will experience or that will be compared. Examples include distinct sleep durations, therapy conditions, or amounts of exposure to stress-related information. Precise definitions make the manipulation observable and reproducible, allowing researchers to relate each condition to measured changes in memory, mood, or behavior.
Different levels create the comparisons needed to examine whether changes in the measured outcome correspond to the experimental condition. When researchers compare conditions systematically, they can evaluate whether sleep duration, therapy condition, or stress-related information is associated with differences in memory, mood, or behavior. The pattern across levels also helps test psychological theories and interventions.
Random assignment and control conditions help isolate the influence of the factor being studied. Random assignment distributes participants across conditions, while a control condition provides a comparison point. Together with standardized procedures, these features reduce confounding effects, making it more defensible to attribute observed differences in a dependent measure to the experimental condition rather than to unrelated influences.
The two variables have different roles in the study’s logic. Researchers vary or compare the experimental condition, then measure the outcome that may change in response. For example, therapy condition can serve as the independent variable, while mood can serve as the dependent variable. Keeping these roles distinct clarifies what the study tests and how results should be interpreted.
A study first specifies the conditions or levels to compare, then assigns or exposes participants to those conditions using a planned procedure. Researchers measure a relevant outcome, such as memory, mood, or behavior, under standardized conditions. They then compare the results across groups or conditions while considering control conditions and possible confounding effects.
These factors are useful when researchers want to examine their effects on psychological outcomes. Sleep duration can be compared with memory performance, therapy condition with mood, and exposure to stress-related information with behavior. Such designs support systematic evaluations of psychological theories and interventions, provided that researchers define the conditions clearly and measure the resulting outcomes consistently.