Stat 133 Midterm 1

# Stat 133 Midterm 1 - NAME GROUP NUMBER STAT 133 MIDTERM 1...

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NAME_______________________ GROUP NUMBER_____________ STAT 133 MIDTERM 1 WINTER 2007 NAME OF MY TA: (CIRCLE ONE) CHAORAN YE JARED SCHUETTER HYEJUNG MOON DEEDRA NICOLET LORI HOFFMAN JUHEE LEE JINGYUAN YANG ADAM LUNDGREN NOTE: WE CAN NO LONGER ANSWER QUESTIONS DURING OUR EXAMS. ANSWER THE QUESTIONS TO THE BEST OF YOUR ABILITY. IF YOU SUSPECT AN ERROR PLEASE MAKE A NOTE ON THE EXAM AND WE WILL LOOK AT IT WHILE GRADING. ACADEMIC INTEGRITY STATEMENT I am seated in the designated building, room and row as listed on the exam seating chart. All of the work shown on this exam is my own; I will not look at anyone else’s paper or collaborate with any student in any way during this exam. I will keep my answers covered during the exam and will not knowingly expose them to anyone. I understand that no additional materials are to be used on this exam other than the exam itself and a calculator (no review sheets, notes, books, etc). I understand that academic misconduct during an exam at The Ohio State University is very serious and can result in my failing this class (or worse.) Signature__________________________________ 1

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NAME_______________________ GROUP NUMBER_____________ Stat 133 Formula Sheet - - = 2 ) ( 1 1 x x n s i - - - = y i x i s y y s x x n r 1 1 y = a + bx x y s s r b = x b y a - = = i i x p x μ x bx a b a + = + y x y x + = + - = i x i x p x 2 2 ) ( σ x bx a b 2 2 2 = + y x y x y x ρσ 2 2 2 2 + + = + y x y x y x 2 2 2 2 - + = - Binomial Distribution k n k p p k n k X P - - = = ) 1 ( ) ( Binomial Distribution Mean = np Variance = np(1-p) - = x z n x z 0 - = n z x × ± * 2 * = m z n Probability Rules P(A or B) = P(A)+P(B)-P(A and B) P(A c )=1-P(A) ) ( ) ( ) | ( B P B and A P B A P = P(A|B)=P(A) if and only if A and B are independent P(A and B) = P(A)P(B|A) = P(B)P(A|B) = P(B and A) P(A c |B) + P(A|B) = 1 Bayes Theorem: ) ( ) | ( ) ( ) | ( ) ( ) | ( ) | ( c c A P A B P A P A B P A P A B P B A P + = 2
NAME_______________________ GROUP NUMBER_____________ MULTIPLE CHOICE PROBLEMS (5 points each) RECORD YOUR ANSWERS ON THE ANSWER SHEET ON THE LAST PAGE WE WILL ONLY GRADE THE ANSWERS ON THE LAST PAGE 1. Suppose you recorded withdrawals from a bank over a day’s time. The data were summarized in the histogram below. Two measures of center were calculated from this data: 176 and 160. One of these numbers is the mean, and the other is the median. Which one is the median? Withdraw Frequency 500 400 300 200 100 30 25 20 15 10 5 0 Histogram of Withdraw a. The median is 176. b. The median is 160.

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## This note was uploaded on 04/08/2008 for the course STAT 133 taught by Professor Rumseyjohnson during the Winter '07 term at Ohio State.

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Stat 133 Midterm 1 - NAME GROUP NUMBER STAT 133 MIDTERM 1...

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