Spring 2013 Exam 2 Solutions - STAT 225 Exam 2 KEY Spring...

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STAT 225 Exam 2 KEYSpring 2013March 4, 2013Name:Choose your Section Time: (Circle one)7:30 AM Pan Chao8:30 AM Pan Chao9:30 AM Mike Lawlor10:30 AM Grant Anderson11:30 AM Faye Zheng12:30 PM Faye Zheng1:30 PM Juan Hu2:30 PM Juan Hu3:30 PM Jeremy Troisi4:30 PM Jeremy TroisiOnline Dr. BaumannDirections1. Show your work on ALL questions. Unsupported work will NOT receive full credit.2. Round answers 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 Earned192931141251469710Cheat Sheet1Total751
Problem 145 students are attending a review session for STAT 225’s 2nd exam. Suppose that each studentasks 5 questions on average in a review session. Let Q be the number of questions for a singlestudent. Assume students ask questions independently of each other.a.2 points:State the distribution and parameter(s) of Q.

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