AP+Statistics+CHapter+10+Section+3-1

# AP+Statistics+CHapter+10+Section+3-1 - If so you need...

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AP Statistics Chapter 10 Section 3

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Decision or description of evidence? Making a decision is different in spirit from testing significance. Choosing a level of significance in advance makes sense if you must make a decision, but not if you wish only to describe the strength of your evidence.
How much evidence is needed to reject the null hypothesis? How plausible is the null hypothesis? If the null hypothesis represents an assumption that the people you must convince have believed for years, strong evidence (small level of significance) will be needed to persuade them. What are the consequences of rejecting the null hypothesis? Will the result of rejecting mean making an expensive change of some kind?

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Unformatted text preview: If so, you need strong evidence (small level of significance). There is no sharp border between “significant” and “insignificant”, only increasingly strong evidence as the P-value decreases. Hawthorne effect • Almost any change in the work place together with knowledge that a study is under way will produce a short-term productivity increase. Statistical Significance Works when: • You decide what effect you are seeking • Design a study to search for it • And use a test of significance to weigh the evidence. P-values and their importance P-values are more informative than the reject-or-not result of a fixed level of significance test....
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## This note was uploaded on 04/10/2011 for the course MATH 1070 taught by Professor Akbas during the Fall '08 term at Georgia State.

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AP+Statistics+CHapter+10+Section+3-1 - If so you need...

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