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Related Concept Videos

One-Way ANOVA: Unequal Sample Sizes01:15

One-Way ANOVA: Unequal Sample Sizes

One-way ANOVA can be performed on three or more samples of unequal sizes. However, calculations get complicated when sample sizes are not always the same. So, while performing ANOVA with unequal samples size, the following equation is used:
One-Way ANOVA: Equal Sample Sizes01:15

One-Way ANOVA: Equal Sample Sizes

One-Way ANOVA can be performed on three or more samples with equal or unequal sample sizes. When one-way ANOVA is performed on two datasets with samples of equal sizes, it can be easily observed that the computed F statistic is highly sensitive to the sample mean.
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Testing a Claim about Mean: Unknown Population SD01:21

Testing a Claim about Mean: Unknown Population SD

A complete procedure of testing a hypothesis about a population mean when the population standard deviation is unknown is explained here.
Estimating a population mean requires the samples to be approximately normally distributed. The data should be collected from the randomly selected samples having no sampling bias. There is no specific requirement for sample size. But if the sample size is less than 30, and we don't know the population standard deviation, a different approach is used; instead...

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Related Experiment Video

Updated: Jul 9, 2026

Midface Hypoplasia and Cranial Base Morphology in Syndromic Craniosynostosis: A Comparative Analysis Study Using a Predictive Regression Model
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Strong postcranial size dimorphism in Australopithecus afarensis: results from two new resampling methods for

Adam D Gordon1, David J Green, Brian G Richmond

  • 1Department of Anthropology, Center for the Advanced Study of Hominid Paleobiology, The George Washington University, Washington, DC 20052, USA. agordon@gwu.edu

American Journal of Physical Anthropology
|November 30, 2007
PubMed
Summary

Australopithecus afarensis exhibited significant postcranial size dimorphism, comparable to gorillas and orangutans. This suggests distinct behavioral and mating strategies compared to modern humans.

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Area of Science:

  • Paleoanthropology
  • Primate evolutionary biology
  • Skeletal biology

Background:

  • Debate exists regarding size dimorphism and social behavior in Australopithecus afarensis.
  • Previous studies used limited variables and small sample sizes, necessitating new analytical approaches.
  • Existing methods for assessing fossil size variation have limitations, such as requiring template specimens.

Purpose of the Study:

  • To introduce novel resampling methods for analyzing multivariate postcranial size dimorphism in fossil hominins.
  • To overcome limitations of previous techniques by incorporating measurements from multiple unassociated elements.
  • To enable significance testing between comparative and fossil datasets, even with missing data.

Main Methods:

  • Development and application of two new resampling techniques for size dimorphism analysis.
  • Inclusion of measurements from the femur, tibia, humerus, and radius from multiple hominin and primate species.
  • Multivariate statistical analysis of postcranial skeletal measurements.

Main Results:

  • Australopithecus afarensis displays postcranial size dimorphism levels similar to gorillas and orangutans.
  • Dimorphism in A. afarensis is significantly greater than in modern humans and chimpanzees.
  • New methods successfully analyzed size variation using multiple unassociated skeletal elements.

Conclusions:

  • Postcranial size dimorphism in Australopithecus afarensis suggests differences in behavioral and mating strategies compared to modern humans.
  • Further research is needed to correlate postcranial dimorphism with social behavior in primates.
  • The findings provide new insights into the evolutionary biology and behavior of early hominins.