Introduction To Statistics And Data Analysis
6th Edition
ISBN: 9781337794503
Author: PECK
Publisher: Cengage
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Textbook Question
Chapter 3.3, Problem 36E
Use the relative frequency distribution constructed in the previous exercise to answer the following questions.
- a. Construct a cumulative relative frequency plot for the Medford rainfall data.
- b. Use the cumulative relative frequency plot of Part (a) to answer the following questions:
- i. Approximately what proportion of years had annual rainfall less than 15.5 inches?
- ii. Approximately what proportion of years had annual rainfall less than 25 inches?
- iii. Approximately what proportion of years had annual rainfall between 17.5 and 25 inches?
Example 3.19 used annual rainfall data for Albuquerque, New Mexico, to construct a relative frequency distribution and cumulative relative frequency plot. The National Climate Data Center also gave the accompanying annual rainfall (in inches) for Medford, Oregon, from 1950 to 2008.
- a. Construct a relative frequency distribution for the Medford rainfall data.
- b. Use the relative frequency distribution of Part (a) to construct a histogram. Describe the shape of the histogram.
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Question 2
The data below provides the battery life of thirty eight (38) motorcycle batteries.
100 83 83 105 110 81 114
99 101 105 78 115 74 96
106
89
94 81 106 91 93 86
79 103 94 108 113 100
117 120
77 93
93 85 76
89 78 88
680
a. Test the hypothesis that mean battery life is greater than 90. Use the 1% level of
significance.
b. Determine if the mean battery life is different from 80. Use the 10% level of
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tables should be provided
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Chapter 3 Solutions
Introduction To Statistics And Data Analysis
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