# stat3309x1n - Stat 3309 Exam I 1 Lets go back to our...

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Stat 3309 - Exam I July 17, 2011 1. Let’s go back to our favorite city; Funkytown. We will collect some rent information again. Here are the values: 106 323 356 374 476 478 517 542 550 565 581 583 612 625 628 652 660 673 689 694 703 781 802 827 846 902 925 956 1029 1158 We know that ¯ x = 653 . 8, s = 222 . 4, and n = 30. a. Find the 79th percentile. b. Find the coeﬃcient of variation, CV . c. Find the z score of 925. d. Find the interval ¯ x ± 2 s . What percentage of the data falls into this interval? 2. The following data values are the ages of people watching the Wendy Williams Show . How YOU doin’? 45 57 65 21 41 35 34 a. Find the sample mean. b. Find the median. c. Find the midrange. d. Find the range. e. Find the variance. f. Find the standard deviation. 3. Here we have the length of student screams (in seconds) during a Stat exam. Eeek! 0.0 0.1 0.1 0.1 0.1 0.2 0.3 0.4 0.5 0.6 0.6 1.0 1.1 1.1 1.1 1.1 1.3 1.3 1.4 1.4 1.9 2.0 2.6 3.2 4.2 1

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a. Construct a frequency table. We know that the starting lower limit is
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## This note was uploaded on 07/24/2011 for the course MATH 3309 taught by Professor Wendall during the Spring '11 term at Hobart and William Smith Colleges.

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stat3309x1n - Stat 3309 Exam I 1 Lets go back to our...

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