m1-09

# m1-09 - STOR 155 Section 2 Midterm Exam 1 Name PID...

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STOR 155 Section 2 Midterm Exam 1 (9/29/09) Name: ______________________________ PID: ___________________________________ Instructions: Both the exam and the bubble sheet will be collected. On the bubble sheet, print your name and ID number, sign the honor pledge, also bubble in your name and ID number. Each question has only one correct choice (decimals may need rounding). Use #2 pencil only (do not use ink) to fill bubble completely. No notes or remarks are accepted. Do not tear or fold the bubble sheet. A grade zero will be assigned for the entire exam if the bubble sheet is not filled out according to the above instructions. The full score of this exam is 40. Every student gets a baseline score 7. In addition, Questions 1 -- 33: 1 point each. Page 1 1. A distributor of appliances is doing a customer satisfaction survey for a manufacturer of DVD players. A sample of 68 clients is asked to rate a particular DVD player on appearance, functionality, ease of use, and price on a 1 to 10 scale, where 1 corresponds to the worst rating and 10 to the best possible rating. A bar graph of the ease of use ratings classified by gender is given below. What percentage of the sampled female clients rated the DVD player as not so easy to use (a rating of 4 or lower)? (1) 28% (2) 29% (3) 38% (4) 62%

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Page 2 Use the following to answer questions 2 and 3: The histogram below represents the height (in inches) of the gold medal–winning high jumps for the Olympic Games up to Sydney 2000. 2. What is approximately the mean height? (1) 75 inches (2) 77.5 inches (3) 82 inches (4) 90 inches 3. What is approximately the percentage of these winning jumps that were at least 7'1” high (85 inches)? (1) 9% (2) 14% (3) 23% (4) 35%
Page 3 Use the following to answer questions 4 and 5: A consumer agency is testing appliances for a series of articles in their magazine. Currently they are working with cook tops and ranges. They have selected 16 of the most commonly used models. Using a series of tests, the agency will estimate the lifetime of these models. A histogram of these (estimated) lifetimes is shown below. 4. What is the proportion of these appliances that is estimated to last longer than 15 years? (1) More than half. (3) Equal to 4/16 = 0.25. (2) Less than half. (4) Unable to determine from this graph. 5. Select a correct description for the shape of the histogram of the estimated lifetimes of these 16 appliances. (1) Symmetric (2) Bimodal (3) Skewed right (4) Skewed left

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Page 4 Use the following to answer questions 6 and 7: During the early part of the 1994 baseball season, many sports fans and baseball players noticed that the number of home runs being hit seemed to be unusually large. Below are separate stemplots for the number of home runs by American League and National League teams based on the team-by-team statistics on home runs hit through Friday, June 3, 1994 (from the Columbus Dispatch
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## This note was uploaded on 11/17/2011 for the course STOR 155 taught by Professor Andrewb.nobel during the Fall '08 term at UNC.

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m1-09 - STOR 155 Section 2 Midterm Exam 1 Name PID...

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