lOW DO WE COMBINE ERRORS? Suppose we measure quantity x with an error of dx and quantity Y with an error of dy What is the error in quantity z if: Z= AX where a is a numerical constant such as T? ·Z=X+Y? ·Z=X-Y? ·Z=XY? ·z=XY? Z is a general function of many quantities?12 HOW DO WE COMBINE ERRORS? • Suppose we measure quantity X with an error of dx and quantity Y with an error of dy • What is the error in quantity Z if: • Z = AX where A is a numerical constant such as π ? • Z = X + Y? • Z = X - Y? • Z = XY? • Z = X/Y? • Z is a general function of many quantities?