stat_exam1a

# stat_exam1a - Name Student ID Exam#1 Form A Statistics...

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Name: Student ID: Exam #1 Form A - Statistics 211 (Fall 2004) This test consists of 8 numbered pages. Make sure you have all 8 pages. It is your responsibility to inform me if a page is missing!!! You have 75 minutes to complete this test. You may use the provided crib sheets, all appropriate tables and a calculator. If I provide partial results—assume they are correct and use them even if they are not. If there is no correct answer or if multiple answers are correct, select the best answer. There is no penalty to wrong answers . . . so guess if you do not know an answer. It is your responsibility to look at the overhead or blackboard about every 15 minutes and to incorporate any relevant information into your test. 1

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Chapter 1 [1] A Stem-and-Leaf plot: a) Is a descriptive method of organizing data. b) The original data set can be reconstructed. c) Is easy to do for small data sets. d) Cannot be used for categorical data sets. e) All of the above. [2] ¯ x = 8 for a data set of size n = 100. We multiply every observation by 5 and recalculate the mean. The new mean is: a) 10 b) 40 c) 500 d) 800 e) Can’t say—it depends on the actual data. [3] For the following data set: 12 , 8 , 7 , 6 , 5 , 4 the median is: a) 5 b) 6 c) 7 d) 8 e) None of the above. [4] In general, a single large outlier will have the greatest impact (in±uence) on: a) Q 1 b) Q 3 c) The mean d) The trimmed mean. e) The median [5] The fourth spread is: a) ¯ x - ¯ y b) Mean - Mode c) Mean - Median d) Q 2 - Q 1 or Q 2 - Q 3 e) Q 3 - Q 1 2
[6] s = 20 for a data set of size n = 100. We add 2 to every observation and recalculate the standard deviation. The new s is: a) 500 b) 10 c) 20 d) 14 e) Can’t say—it depends on the actual data. The following is a histogram of the number of hits per nine-inning baseball game. [7] According to the above histogram, given a random nine-inning baseball games, ap- proximately what percent chance is there of having 9 or 10 hits in that game? a) 10% b) 12% c) 22% d) 80% e) 40% Chapter 2 [8] Suppose that the proportions of blood phenotypes in a particular population are as follows: A B AB O .42 .10 .04 .44 Assuming that the phenotypes of two randomly selected individuals are independent of one another, what is the probability that both phenotypes are O?

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stat_exam1a - Name Student ID Exam#1 Form A Statistics...

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