midterm1_1

midterm1_1 - ECON 139 Duke University Spring 2008 Midterm 1...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
ECON 139 Duke University Spring 2008 Midterm 1 Instructions (PLEASE READ CAREFULLY before starting): This test has a total of 3 problems and 72 points . You have 75 minute Remember to Show Your Work and please be sure that your handwriting is legible ! Be precise but brief. If a correct reply is hidden among wrong, or irrelevant, arguments, you will not get full credit. We will grade only what is written on your exam sheet. There should be plenty of space for all your calculations. There are two extra pages included at the end of the exam to be used as scratch paper. Do not turn in anything besides your exam sheet . Standard errors are in parentheses (unless otherwise noted). Name: TA: Section Day and Time: 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Let Y denote the sample average from a random sample with mean and variance ± 2 : Consider two alternative estimators of : W 1 = n 1 n Y and W 2 = Y 2 : a. (4 points) Show that W 1 and W 2 are both biased estimators of happens to the biases as n ! 1 ? Comment on any important di/erences in bias for the two estimators as the sample size gets large. b. (4 points) Find the probability limits of W 1 and W 2 . Is either estimator consistent? 2
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/03/2011 for the course ECON 139 taught by Professor Alessandrotarozzi during the Spring '08 term at Duke.

Page1 / 12

midterm1_1 - ECON 139 Duke University Spring 2008 Midterm 1...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online