STA4321icexam2-SPRING10

STA4321icexam2-SPRING10 - STA 4321/5325 Spring 2010 Exam 2...

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STA 4321/5325 Spring 2010 Exam 2 Full Name: On my honor, I have neither given nor received unauthorized aid on this examination. Signature: This is a 50 minute exam. There are 4 problems, worth a total of 40 points. Remember to show your work. Answers lacking adequate justification may not receive full credit. You may use one letter-sized sheet (the same size as the lecture notes) of your own notes and a pocket calculator. (You are not required to bring a calculator — you may leave your answers in a form from which the numerical answer could be immediately calculated.) You may not use any books, other references, or text-capable electronic devices. 1. Let X be the number of heads observed in 4196 tosses of a fair coin. (a) Which subcollection of discrete random variables does X belong to? [2 pts] (b) Provide E ( X 2 ). You may use identities established in class about this specific subcollection of discrete random variables. Hint: Write down
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STA4321icexam2-SPRING10 - STA 4321/5325 Spring 2010 Exam 2...

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