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Related Concept Videos

Hypothesis Test for Test of Independence01:16

Hypothesis Test for Test of Independence

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)...
Protection of Alcohols02:31

Protection of Alcohols

This lesson delves into the concept of protection and deprotection of a functional group fundamental to synthetic organic chemistry. These phenomena are explained in the context of aliphatic and aromatic alcohols.
Protection
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Production of Alcohol01:27

Production of Alcohol

Continuous fermentation is a key strategy in industrial ethanol production, particularly when efficiency, scalability, and high yields are essential. This approach allows for uninterrupted operation and optimized resource utilization. The primary feedstock, corn starch, undergoes enzymatic hydrolysis facilitated by α-amylase and glucoamylase. These enzymes break down the starch into fermentable sugars such as glucose, which are readily assimilated by fermentative microorganisms.Fermentation...
Distribution and Dispersion00:54

Distribution and Dispersion

Ecology is the study of how organisms interact with their environment and with one another. An important aspect of ecology is understanding where species are found and how individuals are distributed within those areas. The geographic range of a species refers to the total area where its members are located, while dispersion describes the pattern of spacing of individuals within that range.Geographic Range and Dispersion PatternsWithin a species’ geographic range, individuals may be distributed...
Introduction to Test of Independence01:21

Introduction to Test of Independence

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:
Drug Distribution: Volume of Distribution01:25

Drug Distribution: Volume of Distribution

The volume of distribution refers to the theoretical volume necessary to contain the entire amount of an administered drug at the same concentration observed in the blood plasma. The body's intracellular fluid compartment, which makes up two-thirds of the total body water, is contrasted with the extracellular fluid compartment—comprising plasma and interstitial fluid—that accounts for one-third. The volume of distribution can vary depending on the characteristics of the drug.

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Related Experiment Video

Updated: Jun 17, 2026

Modeling Alcohol Consumption in Rodents Using Two-Bottle Choice Home Cage Drinking and Microstructural Analysis
08:45

Modeling Alcohol Consumption in Rodents Using Two-Bottle Choice Home Cage Drinking and Microstructural Analysis

Published on: November 8, 2024

Community alcohol outlet density and underage drinking.

Meng-Jinn Chen1, Joel W Grube, Paul J Gruenewald

  • 1Prevention Research Center, Pacific Institute for Research and Evaluation, 1995 University Avenue, Suite 450, Berkeley, CA 94704, USA. mengjinn@prev.org

Addiction (Abingdon, England)
|January 19, 2010
PubMed
Summary

Higher alcohol outlet density is linked to increased youth drinking initiation and excessive alcohol use. However, social networks can help teens in low-density areas access alcohol and drinking opportunities.

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Area of Science:

  • Public Health
  • Adolescent Health
  • Environmental Criminology

Background:

  • Community characteristics, such as alcohol outlet density, may influence adolescent substance use.
  • Understanding the environmental factors associated with youth drinking is crucial for prevention strategies.

Purpose of the Study:

  • To investigate the association between community alcohol outlet density and adolescent alcohol consumption.
  • To examine how factors like socioeconomic status and individual mobility moderate this relationship.

Main Methods:

  • Longitudinal study of 1091 adolescents (14-16 years) across 50 California zip codes with varied alcohol outlet density and income.
  • Hierarchical linear modeling used to analyze the relationship between alcohol outlet density and frequency of general and excessive drinking.
  • Controlled for zip code median household income, age, gender, race/ethnicity, personal income, mobility, and perceived peer/parental drinking.

Main Results:

  • Higher alcohol outlet density was associated with higher initial levels of drinking and excessive drinking among adolescents.
  • Adolescents in lower alcohol outlet density areas showed faster growth in drinking frequency.
  • Access to a car through friends mitigated the association between alcohol outlet density and adolescent drinking.

Conclusions:

  • Community alcohol outlet density is a significant factor in the initiation of underage drinking, particularly for adolescents with limited mobility.
  • Social networks and increased mobility can enable youth in low-density areas to access alcohol and drinking opportunities beyond their immediate community.