calculating mean accuracy with the sample of data what is the formula for calculating the ssx in a regression analysis? what is the mean of the sample variance what is the ssx/y in math terms what is statistical variance of sample how do you get the t statistic from the sample size when is ssx/y used to find the mean of a regression test what is the t statistic in regression what is the difference between the t statistic and ssx? why is the sum of squares used when formulating variance how to find the value of the mean of the sample how to calculate the sum of squares in a regression what is the function of sum of squares in statistics when do you find a better mean value from bigger sample? how to find the sample variance what is the ssx in regression what is the sum of squares for the variance in statistics how to use variance as t-statistic how to figure the sum of squares for a regression analysis what is the ssx/y for the variance