Temple University
Department of Economics
Hwk 3: Sampling and Estimation
Fall 2006
1. Add or subtract a constant leaves the variance unchanged.
Suppose we have a random variable X and construct a new r.v. called Y = X - c.
2. Variance of a constant times a r.v. is the the square of the constant times the variance of the r.v.
3. This is an example of what you demonstrated in problem 1
4. An F-distribution
5. The Gamma Distribution
The density for the gamma is
The log likelihood is the log of the product of the densities over the sample.
where