hi, just a simple question i have a linear graph y=mx+c lets say my y values have an uncertainty of ±1 . my x values don't have uncertainties. so what will my gradient's uncertainty be? PS: can i just use the linear least square fit function from microsoft excel? do they calculate the same uncertainty?i.e is the standard deviation from this method, the same as the uncertainty that i am going to calculate as per above? thanks!