HW01_Sol - Stat13 Homework 1

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Unformatted text preview: Stat13 Homework 1 http://www.stat.ucla.edu/~dinov/courses_students.html Suggested Solutions 2.7 A dendritic tree is a branched structure that emanates from the body of a nerve cell. As part of a study of brain development, 36 nerve cells were taken from the brains of newborn guinea pigs. The investigators counted the number of dendritic branch segments emanating from each nerve cell. The numbers were as follows: 23 30 54 28 31 29 34 35 30 27 21 43 51 35 51 49 35 24 26 29 21 29 37 27 28 33 33 23 37 27 40 48 41 20 30 57 (a) Construct a stem-and-leaf diagram of the data. (b) Construct a dotplot of the data. Ans: (a) We use split stems in the following stem-and-leaf diagram. 2 | 011334 2 | 677788999 3 | 0001334 3 | 55577 4 | 013 4 | 89 5 | 114 5 | 7 (b) 2.8 Consider the data presented in Exercise 2.7. Construct a frequency distribution and display it as a table and as a histogram. Ans: There is no single correct answer. One possibility is Branches Frequency (no. cells) 20-24 6 25-29 9 39-34...
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This note was uploaded on 11/13/2010 for the course CHM CHM2132 taught by Professor Goto during the Fall '07 term at University of Ottawa.

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HW01_Sol - Stat13 Homework 1

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