2010 Midterm

2010 Midterm - MIDTERM EXAM STAT 101 Instructor A Rakhlin...

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MIDTERM EXAM STAT 101, Instructor: A. Rakhlin October 28, 2010 Student Name: Section: Instructions Use the space provided to answer questions. You can use the back of these pages as scratch paper. You must show work and give explanations (except for the multiple-choice questions). Rules of uniformity: One-sided letter crib sheet, calculator ok (even with statistical functions and graphing), otherwise closed notes, closed book. No cell phones visible! Rules of Fairness: Complete this exam entirely on your own. Do not acquire information from other stu- dents or the outside in any form. Do not take copies of this exam out of this room. You have two hours for this exam. Any student observed continuing to write after time has been called will be documented and points will be deducted. Rules of Consideration: Be considerate to others by not causing commotion and distraction. If you finish early, leave quietly; avoid slamming doors. Honor code applies to the above Rules. Your signature: About this test: When more than one choice seems reasonable, pick the one that is best. STOP WAIT UNTIL YOU ARE INSTRUCTED TO PROCEED. 18 questions for a total of 100 points.
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STAT 101 Midterm Exam 1. (3 points) The median of a sample with data values of 10, 20, 12, 17, 16 is (a) 12 (b) 15 (c) 16 (d) 17 2. (3 points) The units of the residuals are the same as (a) Units of the response variable (b) Units of the independent variable (c) Residuals have no units (d) Residuals have standard units 3. (3 points) (T/F) If all of the bars in a bar chart have the same length, then the categorical variable shown in the bar chart has no variability. (a) True (b) False 4. (3 points) To determine association between two numerical variables, we can (a) compare their marginal distributions (b) look for patterns in the scatterplot (c) check if the cells of a mosaic plot align (d) all of the above 5. (3 points) (T/F) The least squares line always goes through the point (¯ x, ¯ y ) (a) True (b) False 6. (3 points) (T/F) If a distribution is bell shaped, then about 5% of the z-scores are larger than 1 or less than -1.
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This note was uploaded on 04/04/2012 for the course STAT 101 taught by Professor Heller during the Fall '08 term at UPenn.

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2010 Midterm - MIDTERM EXAM STAT 101 Instructor A Rakhlin...

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