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I go through ur correlation & regression chapters but i did not find derivation of any formula. i would like to know the derivation of all formulas. would u pleasure to tell the above
In the case of 'r' taking a negative value, how can I interpret the Probable error value i.e say I get 'r'= -0.89 & using the formula indicated I get a value of 0.0625 for the P.E (which is positive), how do I interpret the significance of the 'r' value. Just because r<P.E in this case does it cease to be significant-in which case all negative values of 'r' will not be significant, isn't it?
Does a 0.9 coefficient imply that sales increase by 90% if advertising expenditure increases by 100%?
nice