Introduction to Statistics and Data Analysis
5th Edition
ISBN: 9781305115347
Author: Roxy Peck; Chris Olsen; Jay L. Devore
Publisher: Brooks Cole
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Textbook Question
Chapter 1.4, Problem 12E
Classify each of the following variables as either categorical or numerical. For those that are numerical, determine whether they are discrete or continuous.
- a. Number of students in a class of 35 who turn in a term paper before the due date
- b. Gender of the next baby born at a particular hospital
- c. Amount of fluid (in ounces) dispensed by a machine used to fill bottles with soda pop
- d. Thickness of the gelatin coating of a vitamin E capsule
- e. Birth order classification (only child, firstborn, middle child, lastborn) of a math major
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Do bonds reduce the overall risk of an investment portfolio? Let x be a random variable representing annual percent return for the Vanguard Total Stock Index (all Stocks). Let y be a random variable representing annual return for the Vanguard Balanced Index (60% stock and 40% bond). For the past several years, assume the following data. Compute the sample mean for x and for y. Round your answer to the nearest tenth.
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Do bonds reduce the overall risk of an investment portfolio? Let x be a random variable representing annual percent return for the Vanguard Total Stock Index (all Stocks). Let y be a random variable representing annual return for the Vanguard Balanced Index (60% stock and 40% bond). For the past several years, assume the following data. Compute the range for variable y.
X
12
0
36
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Y
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26
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Do bonds reduce the overall risk of an investment portfolio? Let x be a random variable representing annual percent return for the Vanguard Total Stock Index (all Stocks). Let y be a random variable representing annual return for the Vanguard Balanced Index (60% stock and 40% bond). For the past several years, assume the following data. Compute the range for variable y.
X
12
0
36
21
35
23
24
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Y
10
-2
26
15
22
18
15
-2
-3
-10
Chapter 1 Solutions
Introduction to Statistics and Data Analysis
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