3. A measurement Y depends on variables (a,b,c), the standard deviation of these variables are known: (σa, σb,σc). Assume that the covariance terms can be ignored, answer the following:
申論題內容
(c) IfY = a/b t ec, where e is natural logarithm. What is the expression of the error term for y? [3%]
Now assume that the covariance term for a and c, , cannot be ignored.