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Null and Alternative Hypotheses

Null and Alternative Hypotheses

The actual hypothesis testing begins by considering two hypotheses. They are termed the null hypothesis and the alternative hypothesis. These hypotheses contain opposing viewpoints.
The null hypothesis, denoted by H0 is a statement of no difference between the variables—they are not related. This can often be considered the status quo. As a result if you cannot accept the null, it requires some action.
The alternative hypothesis, denoted by H1 or Ha, is a claim about the...

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The outcome of any hypothesis testing leads to rejecting or not rejecting the null hypothesis. This decision is taken based on the analysis of the data, an appropriate test statistic, an appropriate confidence level, the critical values, and P-values. However, when the evidence suggests that the null hypothesis cannot be rejected, is it right to say, 'Accept' the null hypothesis?
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Testing the low dose mixtures hypothesis from the Halifax project.

William H Goodson¹, Leroy Lowe², Michael Gilbertson³

¹Department of Surgery, California Pacific Medical Center Research Institute, San Francisco, CA, 94115, USA.

Reviews on Environmental Health

|August 25, 2020

Summary

This summary is machine-generated.

Chemical mixtures, even at low doses, may cause cancer by affecting multiple cancer hallmarks. Current research on chemical mixtures is insufficient and often lacks human relevance, necessitating new study designs.

Keywords:

Halifax project carcinogenesis chemical mixtures environment low dose mixtures xenoestrogens

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Area of Science:

Environmental Health
Toxicology
Cancer Research

Background:

A group of 174 scientists identified 89 non-carcinogenic chemicals that could act as a virtual carcinogen in mixtures.
This supports the concern that chemical safety research is incomplete if it does not evaluate mixtures.
The Halifax Project proposed the Low-Dose Carcinogenesis Hypothesis regarding mixtures of disruptive chemicals.

Purpose of the Study:

To review existing empirical data on biological exposures to chemical mixtures.
To assess the available research to inform future studies on low-dose chemical mixture carcinogenesis.
To identify research gaps and propose new directions for studying chemical mixture effects.

Main Methods:

Conducted a mini-review of published studies on chemical mixtures.
Included studies reporting different chemical concentrations and compositions.
Assessed the relevance of chemical concentrations to human exposure levels.

Main Results:

Found a paucity of research on the carcinogenic potential of chemical mixtures.
Most studies focused on hormone-related processes.
Many studies used non-human-relevant chemical concentrations and experimental designs.

Conclusions:

New research programs are needed to study low-dose chemical mixtures.
Research should utilize human-relevant concentrations and non-malignant specimens when possible.
Studies should expand beyond endocrine endpoints and investigate mixture-specific effects.