Something is significant if it is something unusual or rare. This is also true i

Question

Something is significant if it is something unusual or rare. This is also true in statistics. Something is significant if the probability of it occurring is very small. Thus it is significant. Explain to your classmates the purpose of a critical value. What is it used for? Also, explain the difference in a one-tail test and two-tailed test. What causes these to be different and where would you use a one-tail test instead of a two-tailed test? Significance leads to the importance of testing. What is the purpose of the null hypothesis? What is the purpose of the alternative hypothesis? Explain what inferences or decisions you are able to make and not make from the test.

Explanation / Answer

Purpos of critical value:

A critical value is the point (or points) on the scale of the test statistic beyond which we reject the null hypothesis, and is derived from the level of significance of the test. You may be used to doing hypothesis tests like this: Calculate test statistics.

Use

A critical value is used in significance testing. It is the value that a test statisticmust exceed in order for the the null hypothesis to be rejected.

Diferenc between one and two tailed tests:

The fundamental differences between one-tailed and two-tailed test, is explained below in points:

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