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If the sample size is less than 30, then we need to make the assumption that X (the volume of liquid in any cup) is normally distributed. This forces (the mean volume in the sample) to be normal.
If V(X) = is known,
If V(X) is not known, ~ tn-1.
who invented the chi square test and why? what is central chi square and non central chi square test? what is distribution free statistics? what are the conditions when the chi squ
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#quesgraphical representation of data
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