Is the result of unsystematic differences among participants; that portion of the total variance in a set of data that remains unaccounted for a systematic variance is removed; variance that is unrelated to the variables under investigation in a study.
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Sse = ssr / ( n - k)
It depends entirely on the variance (or standard error).
no
Each treatment is applied more than once per block. This makes it possible to enhance the error variance estimate by extracting some sampling variance from it. See the link for a visual example.
Favourable variance is that variance which is good for business while unfavourable variance is bad for business