Temple University
Department of Economics

Economics 8009
Econometrics I
Fall 2008
1. How many of each type of truck?

2. Inverse of trig functions

3. Find the determinant.

4. What values of x

==>

No inverse exists for x = -1 
5. Find the matrix A that yields the following eigen values and eigen vectors.

For each eigen vector -- eigenvalue pair we have
Ax-lx = 0
So we have nine equations in nine unknowns.

6. A continuous random variable: f(u) = 1/(5u)

(a) Evaluate f(u)

(b) Graph f(u)

(c) Find cumulative density

(d) Evaluate F(u) at 3 and 5

(e) Graph F(u)

7. Histogram and statistics

(a) Histogram

(b) Mean from grouped data

(c) Mean from raw

(d) sample std dev

(e) Confidence Interval

(f) Test of population mean

(g) Test of Variance

8 Savings Function: In the matrix that follows the order is Year, Intercept, S, S-1, Y, i

(a) Estimate parameters

(b) Coefficient of Determination

(c) Significant coefficients?

(d) Short run propensity to save is 0.158
(e) The long run or steady state propensity to save is 0.158/(1-(-.0855)) = 0.146