This preview shows pages 1–4. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: STATISTICS 116 MIDTERM EXAM Thursday May 10, 2007 Name: Student ID: Instructions: 1. Print your name and student ID number. 2. There are six problems, each worth 10 marks each. 3. You must show all your work to get full credit. 4. If you get stuck on a problem, move onto another one. 5. Good luck! 1 1. Suppose ( X, Y ) has the following joint probability density function: f X,Y ( x, y ) = k ( x y ) , y x 1 (a) Find k . (b) Find the marginal probability density functions f X ( x ) and f Y ( y ). (c) Find the conditional probability density functions f X  Y ( x  y ) and f Y  X ( y  x ). (d) Find E ( X ) and E ( Y ). 2 2. Your nextdoor neighbor has a rather old and temperamental burglar alarm. If someone breaks into his house, the probability of the alarm sounding is 0 . 95. In the last 2 years, though, it has gone off on 5 different nights, each time for no apparent reason. Police records show that the chances of a particular home being burglarized in your community on any given night are 2 in 10...
View
Full
Document
This note was uploaded on 01/13/2010 for the course STATS 116 taught by Professor Staff during the Spring '07 term at Stanford.
 Spring '07
 Staff
 Statistics, Probability

Click to edit the document details