what is the coefficient of determination for hours? what is r2d what is the coefficient of determination? what the coefficient of determination what is the coefficient of determination of a variable? coefficient of determination what is the coefficient of determination which is a coefficient of determination what is the coefficient of determination of a variable what is coefficient of decision coefficient of determination calculating variability what is the calculation coefficient of determination of time what is the coefficient of determination what is the coefficient of determination? how much of the variability between variables is explained by hours? what is the coefficient of determination what is the coefficient of determination what is the coefficient of determination average coefficient of determination what is the coefficient of determination