Explain the concept of significance? Explain when to use a Z score and how to interpret...

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Explain the concept of significance? Explain when to use a Z score and how to interpret...

Explain the concept of significance?

Explain when to use a Z score and how to interpret it

math Statistics-And-Probability

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Answer 1

Answer #1

A very important aspects of the sampling theory is the study of test of significance,which enables us to decide on the basis of the sample results,if

1) the deviation between the observed sample statistics and the hypothetical parameter value ,or

2) the deviation between two independent sample statistics; is significant or might be attributed to chance or the influence of sampling.

When the sample size is greater than 30 then by use of central limit theorem we can use standard normal distribution or Z- test.

If the calculated z-statistic value is less than tabulated z-score on the normal table then we don't reject the null hypothesis and if calculated z-statistic value is greater than tabulated z-score then we reject the null hypothesis.

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Answer 2

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