STAT 225 Summer 2013 Exam 2 - Summer 2013 Exam 2 STAT 225...

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Summer 2013 Exam 2STAT 225July 9, 2013Name:Choose your Section Time: (Circle one)Wutao Wei (8:40 AM)Xian He (9:50 AM)Xiang Han (11:00 AM)Glen DePalma (1:00 PM)ONLINEDirections1. Show your work on ALL questions. Unsupported work will NOT receive full credit.2. Decimal answers should be exact, or to exactly 4 significant digits.3. You are responsible for upholding the Honor Code of Purdue University. This includesprotecting your work from other students.4. Please write legibly. If a grader cannot read your writing, NO credit will be given.5. You are allowed the following aids:(a) a one-page 8.5”x11” handwritten cheat sheet(b) Scientific Calculator (in accordance with the syllabus)(c) Pencils or pens6. Cheat sheets with photocopied or printed information are not allowed and are subject todisciplinary actions as specified in the syllabus.7. Instructors will not interpret questions for you. If you do have questions, wait until youhave looked over the whole exam so that you can ask all your questions at one time.8. Turn off your cell phone before the exam begins.ProblemPoints PossiblePoints Earned1102133104115966Cheat Sheet1Total601
Problem 1An urn contains 4 white and 4 black balls. We randomly choose 4 balls.a. SupposeWis the number of white balls in the sample.What is the distribution (andparameters) ofW?

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