Suppose we have two samples based upon a large N, and in which there is no corrèlation between the two sets of data. For the following obtained results, find whether the two means are dif- ferent or not. X, = 50, X, = 55 N, = 90, N, = 100 S, = 8.5, S, = 7.5 %3D %3D

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A: A _______ is a numerical quantity computed from the data of a sample and is used to reach a decision...

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Q: Finally expected loss

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Q: 4, find the standard deviationi of the second. sub-group.

A: Here use formula of grouped standard deviation