not otherwise....split half method is one way of determining reliability of your test and Spearman-Brown formula is a technique used to re-calculate the correlation of your test when you split your test items into half.... this means that the result of Spearman-Brown provides you the correlation of your test in full length.
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Nothing can be found for a "dream method math formula." There is a site for learning math at the elementary level called dreambox. It is not free, but you can try it for free. See the Related Link to go to the site.
same as double declining balance method, 200%
formula for finding mean through direct mean method: sigma fi xi /sigma fi
NO
"Least Cubic Method" Also called "Generalized the Least Square Method", is new Method of data regression.