prac-mid1

prac-mid1 - STOR 155 Practice Midterm 1 Fall 2009...

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STOR 155 Practice Midterm 1 Fall 2009 INSTRUCTIONS: BOTH THE EXAM AND THE BUBBLE SHEET WILL BE COLLECTED. YOU MUST PRINT YOUR NAME AND SIGN THE HONOR PLEDGE ON THE BUBBLE SHEET. YOU MUST BUBBLE-IN YOUR NAME & YOUR STUDENT IDENTIFICATION NUMBER. EACH QUESTION HAS ONLY ONE CORRECT CHOICE (decimals may need rounding). USE "NUMBER 2" PENCIL ONLY - DO NOT USE INK - FILL BUBBLE COMPLETELY. NO NOTES OR REMARKS ARE ACCEPTED - DO NOT TEAR OR FOLD THE BUBBLE SHEET. A GRADE OF ZERO WILL BE ASSIGNED FOR THE ENTIRE EXAM IF THE BUBBLE SHEET IS NOT FILLED OUT ACCORDING TO THE ABOVE INSTRUCTIONS. 1. This is a standard deviation contest. Which of the following sets of four numbers has the largest possible standard deviation? A) 0, 0, 10, 10 B) 7, 8, 9, 10 C) 0, 1, 2, 3 D) 5, 5, 5, 5 2. What interval (on the horizontal axis) corresponds to the middle 50% of area under the standard Normal density curve? A) (0.4017, 0.5987) B) (-0.5, 0.5) C) (-0.67, 0.67) D) (-0.25, 0.25) 3. A stemplot of a set of data is roughly symmetric, but the data do not even approximately follow the 68-95-99.7 rule. We conclude that the data are A) standard normal. B) normal. C) normal, but they are not standard normal. D) not normal. Page 1
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4. Which of the following is likely to have a mean that is smaller than the median? A) The scores of students (out of 100 points) on a very difficult exam on which most score poorly, but a few do very well. B) The prices of homes in a large city. C) The salaries of all National Football League players. D) The scores of students (out of 100 points) on a very easy exam in which most score perfectly, but a few do very poorly. 5. Use the following density curve to answer the question below. For this density curve, what percent of the observations lie between 0.25 and 1.2? A) 47.5% B) 52.5% C) 95% D) 25% Page 2
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6. A sample was taken of the salaries of 20 employees of a large company. The following are the salaries (in thousands of dollars) for this year. For convenience, the data are ordered. According to corporate policy, every employee will receive a 5% pay increase every
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prac-mid1 - STOR 155 Practice Midterm 1 Fall 2009...

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