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Related Concept Videos

What is a Hypothesis?01:14

What is a Hypothesis?

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A hypothesis can be a simple sentence or statement about a property or any phenomenon observed or predicted for a population. It is usually a claim about a  property of the population. It can be stated for any field observations or experiments. A hypothesis statement cannot be said to be right or wrong as it is merely a statement. It needs to be tested through an elaborate data collection process and an appropriate statistical test. A hypothesis should be a general but not a vague...
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Hypothesis Test for Test of Independence01:16

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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)...
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Types of Hypothesis Testing01:11

Types of Hypothesis Testing

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There are three types of hypothesis tests: right-tailed, left-tailed, and two-tailed.
When the null and alternative hypotheses are stated, it is observed that the null hypothesis is a neutral statement against which the alternative hypothesis is tested. The alternative hypothesis is a claim that instead has a certain direction. If the null hypothesis claims that p = 0.5, the alternative hypothesis would be an opposing statement to this and can be put either p > 0.5, p < 0.5, or p...
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Errors In Hypothesis Tests01:14

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When performing a hypothesis test, there are four possible outcomes depending on the actual truth (or falseness) of the null hypothesis and the decision to reject or not.
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Drug Repurposing Hypothesis Generation Using the "RE:fine Drugs" System05:10

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Here we describe a protocol using the web-based drug repurposing hypothesis generation tool: "RE:fine Drugs." This protocol can be modified to a user's preferences at the level of the query type (gene, drug or disease) and/or the range of available advanced options.
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Statistical Hypothesis Testing01:16

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Hypothesis testing is a critical statistical procedure facilitating informed, evidence-based decisions. It begins with a hypothesis, which is a tentative explanation, or a prediction about a population parameter. This hypothesis can be either a null hypothesis (H0), indicating no effect or difference, or an alternative hypothesis (Ha), suggesting an effect or difference.
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Updated: Jan 19, 2026

Drug Repurposing Hypothesis Generation Using the "RE:fine Drugs" System
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Drug Repurposing Hypothesis Generation Using the "RE:fine Drugs" System

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Whither the challenge hypothesis?

John C Wingfield1, Marilyn Ramenofsky1, Robert E Hegner2

  • 1Department of Neurobiology, Physiology and Behavior, University of California, Davis, CA 95616, USA.

Hormones and Behavior
|September 17, 2019
PubMed
Summary
This summary is machine-generated.

Environmental endocrinology uses hormone levels to study animal behavior in natural settings. Analyzing data by life stages, not just dates, reveals species-specific hormone patterns and individual differences, advancing the field.

Keywords:
AggressionChallenge hypothesisMating systemsParental careTestosterone

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Related Experiment Videos

Last Updated: Jan 19, 2026

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Area of Science:

  • Environmental endocrinology
  • Comparative endocrinology
  • Animal behavior

Background:

  • Assay methods for circulating hormone levels revolutionized endocrinology for free-living and captive animals.
  • Environmental endocrinology revealed differences between wild and captive animal endocrine profiles, often deviating from predictions.
  • Data organization by life history stages (e.g., reproduction, migration, molt) is crucial for accurate analysis.

Purpose of the Study:

  • To explore the development of environmental endocrinology over the past fifty years.
  • To examine the evolution and impact of the "Challenge Hypothesis" on understanding hormone-behavior interactions.
  • To highlight how field and laboratory studies have shaped current concepts in the field.

Main Methods:

  • Analysis of hormone levels in free-living and captive animals across various taxa.
  • Application of the "Challenge Hypothesis" to predict hormonal responses to social challenges.
  • Comparative studies across different life history stages and environmental contexts.

Main Results:

  • Stage-organized analyses revealed species-specific hormone secretion patterns and significant inter-individual variation.
  • The "Challenge Hypothesis" spurred research into the hypothalamo-pituitary-gonad axis and testosterone responses to social challenges.
  • Tests of the hypothesis across vertebrates and insects led to broader concepts in environmental endocrinology.

Conclusions:

  • The original "Challenge Hypothesis" is simplistic, but its testing has been seminal to environmental endocrinology.
  • Environmental context and social challenges significantly influence hormonal responses.
  • Future research directions include integrating genetic and transcriptome analyses for deeper insights.