Inferential Statistical Analysis

Soaring Crane
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The basis of inferential (testing) statistical analysis is that data are composed of two elements,

a. theoretical expectation + error
b. mean + standard error

Would the two correct elements be listed in choice a.?

The mean of a sample and the standard error (which is the sample’s standard deviation?) is more descriptive than inferential (testing), right? (Or did I completely confuse the terms?)

Thank you.
 
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Where did you get such theory?
 

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