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Hypothesis & Null Hypothesis

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How does hypothesis testing contribute to the scientific knowledge base? What is one example of a null hypothesis statement?

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OTA 105878/Xenia Jones

A hypothesis is a proposed explanation, an opinion that positions itself to be a probable 'truth' about a particular phenomenon. The thing about a hypothesis is that it is yet to be proven even if said hypothesis is based on expert opinion and validated experience and observation. It is a supposition, a hunch towards the origins, causes, effects and nature of an observable phenomenon. Every theory starts in the form of a particular hypothesis and dependent of the test, research and experiment conducted to disprove or prove the hypothesis, the theory-outcome either changes or remains. Working hypothesis is important in scientific research. When certain phenomenon are observed without explanation or cause being that there is yet no available scientific theory to explain it, a ...

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The solution is a 607 word essay that explains the importance of hypothesis testing in scientific tests/ knowledge exploration. Null hypothesis is also explained. References are listed to provide room for further research. A word version of the solution is attached for easy printing.

See Also This Related BrainMass Solution

Null hypothesis - Testing

A stock analyst wants to determine whether there is a difference in the mean rate of return for
three types of stock: utility, retail, and banking stocks. The following sample information is

Rates of Return
Utility Retail Banking
14.3 11.5 15.5
18.1 12 12.7
17.8 11.1 18.2
17.3 11.9 14.7
19.5 11.6 18.1

a. Using the .05 level of significance, is there a difference in the mean rate of return among the
three types of stock?

b. Suppose the null hypothesis is rejected. Can the analyst conclude there is a difference
between the mean rates of return for the utility and the retail stocks? Explain.

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