Practice Exam 1 - Practice Exam 1 1. There are 15 numbers...

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Practice Exam 1 1. There are 15 numbers on a list, and the mean is 25. The smallest number on the list is changed from 12.9 to 1.29. Circle the correct answer(s): a. The mean decreases by 0.774 b. It is impossible to calculate the change in the mean c. The median decreases by 0.774 d. The median remains unchanged Problems 2-4 A class of 60 students took a quiz. 15 students scored 4 points, 18 students score 3 points, 12 students scored 2 points, 9 students scored 1 point, and 6 students scored 0. 2. The mean quiz score for the class is a. 2.74 b. 2.45 c. 1.74 d. 2.6 3. The standard deviation of the quiz scores is a. 1.294 b. 0.294 c. 2.294 d. 1.675 4. The median of the quiz scores is a. 3.5 b. 2 c. 3 d. 4.5 Problems 5-7 Following is the stem-and-leaf plot for data on hazardous waste sites per state: Leaf unit:10 0 1234456889 1 000111222233456778899 2 023459 3 03789 4 0 5 58 6 7 7 8 1 9 6 10 27
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5. What is the lowest number of hazardous waste sites per state? a. 0 b. 1 c. 0.1 d. 10 6. What is the shape of the distribution of hazardous waste sites per state? a. Bell-shaped b. Skewed right c. Skewed left d. Bimodal 7. What is the Q1 for the given dataset? a.10 b.11 c.100 d.10.5 8. For a right skewed distribution: a. Mean=Median b. Mean > Median c. Mean< Median d. There is no relation between mean and median. Problems 9-10 There are two accepted methods for measuring latent heat of ice: an electrical method and a method that uses mixtures. He measured twelve samples using the electrical method: 79.98, 80.04, 80.02, 80.04, 80.03, 80.04, 79.97, 80.05, 80.03, 80.02, 80.00, 80.10 9. The first quartile of the dataset is: a. 80.02 b. 80.01 c. 80.10 d. 80.00 10. The third quartile of the dataset is: a. 80.04 b. 80.075 c. 80.03 d. 80.05 11. The IQR of the dataset is: a. 0.04 b. 0.03 c. 3.25 d. 0.13
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12. The 90 th percentile of the dataset is: a. 80.10 b. 80.04 c. 80.075 d. 80.05 13. A and B are independent events. Which of the following are true? a. A c and B c are independent. b. P ( A U B ) = P ( A ) + P ( B ) c. P ( A B ) = P ( A ). P ( B ) d. All of the above are true 14. A system contains two components, A and B, connected in series. The system works only if both A and B function. A and B work independently. The probability that A fails is 0.05, and the probability that B works is 0.97. The probability that the system
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This note was uploaded on 08/05/2011 for the course STA 3032 taught by Professor Kyung during the Summer '08 term at University of Florida.

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Practice Exam 1 - Practice Exam 1 1. There are 15 numbers...

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