exam01_answers_easy

exam01_answers_easy - STA 3024 Summer A 2011 Name: Exam 1...

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STA 3024 Summer A 2011 Exam 1 (Form Code X) Name: UFID: This is 75 minutes exam. You have to answer 20 multiple choice questions. Each question is worth 5 points that makes the whole exam worth 100 points. There is only one correct answer for each question. You need to bubble the correct answer on the scantron to get credit. Only scantron and not this exam will be graded. You have to turn in both exam and scantron. You can use a calculator but you cannot use any supplemented materials not included in this exam. On this paper , write your name and UFID . You also need to sign and date this exam below . On your scantron , bubble your name, UFID, and exam Form Code (please see upper right corner of this page for your form code.) You also need to bubble your section number which is 1053 . There are no special codes. A formula sheet and chi-squared table are provided on the last page. On my honor I have neither received or given or planning to give any aid on this exam as well as disclose its contents to the ones who is going to take it after me. Name: DATE:
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1. Sample odds ratio. Calculate the sample odds ratio for the conditional proportions shown below. (HINT: Use the formula from the formula sheet) Response Gender Yes No Total Female 0.333 0.667 1.000 Male 0.184 0.816 1.000 (A) 1.479 (B) 1.810 2.214 (C) 4.435 (D) 8.883 2. Probability and Independence. Consider the probability space that is represented by the single toss of the die. That is the set of outcomes is Ω = { 1 , 2 , 3 , 4 , 5 , 6 } and the probability of each outcome is equal to 1 6 . Now consider the following events. A = { 1 , 3 , 5 } i. e. A stands for odd numbers. B = { 1 , 2 , 3 , 4 , 5 , 6 } i.e. B stands for any number from 1 to 6 including 1 and 6 . C = { 1 , 2 , 3 } i. e. C stands for getting 1 , 2 or 3 . Please identify the pairs of independent events out of the three events mentioned above using the definition formula of independence . Please note that all outcomes in Ω are equally likely. (HINT: Notice that P ( B ) = 1 . Then try to remember what is the intersection for our case.) (A) Pair ( A and B ) only. (B) Pair ( A and C ) only. (C) Pair ( A and B ) and pair ( A and C ). Pair ( A and B ) and pair ( C and B ). (D) All three possible combinations i.e. ( A and B ), ( A and C ) and ( C and B ). 3. Complements. ( Example 1.8 from the notes) We randomly draw one card from a standard 52 -card deck. Let A be the event of drawing a spade. What is the complement event for A ? That is you are required to identify the the complement event A c . (A) A c stands for drawing a face card ( K , Q , or J ). (B) A c stands for the event of drawing both a spade and a face card. (C) both (A) and (B) above but not (D) or (E) below.
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exam01_answers_easy - STA 3024 Summer A 2011 Name: Exam 1...

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