Chapter 2: Q. 2.79 (page 69)
Construct a stem-and-leaf diagram for the data, using two lines per stem.

Short Answer

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Chapter 2: Q. 2.79 (page 69)
Construct a stem-and-leaf diagram for the data, using two lines per stem.


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State three of the most important guidelines in choosing the classes for grouping a quantitative data set.
Class Levels. Earlier in this section, we considered the political party affiliations of the students in Professor Weiss's introductory statistics course. The class levels of those students are as follows, where Fr, So, Jr, and Sr denote freshman, sophomore, junior, and senior, respectively.

Old Faithful. Old Faithful is a geyser in Yellowstone National Park that erupts at relatively predictable intervals. Since 2000, the eruptions of Old Faithfull occur on average every 90 minutes. Information on the daily eruptions of Old Faithful can be found on the website of The Geyser Observation and Study Association (GOSA). The following data provide the times between eruptions, in minutes, for Old Faithful over a two-day period.
96 | 68 | 99 | 97 | 92 | 61 | 105 | 89 |
95 | 71 | 93 | 104 | 85 | 107 | 91 | 97 |
99 | 86 | 102 | 93 | 99 | 64 | 102 | 86 |
101 | 81 | 117 | 87 | 106 | 93 | 106 | 106 |
a. Use cutpoint grouping with a first class of 60 -under 70 to construct a frequency histogram of the times between eruptions.
b. Identify the shape of the distribution with regard to modality.
c. Identify the shape of the distribution with regard to symmetry (or nonsymmetry).
d. If the distribution is unimodal and nonsymmetric, classify it as either right skewed or left skewed.
Adjusted Gross Incomes. The Internal Revenue Service (IRS) publishes data on adjusted gross incomes in Statistics of Income, and Individual Income Tax Returns. The following relative frequency histogram shows one year's individual income tax returns for adjusted gross incomes of less than .
Use the histogram and the fact that adjusted gross incomes are expressed to the nearest whole dollar to answer each of the following questions.
a. Approximately what percentage of the individual income tax returns had an adjusted gross income betweenand , inclusive?
b. Approximately what percentage had an adjusted gross income of less than ?
c. The IRS reported that individual income tax returns had an adjusted gross income of less than . Approximately how many had an adjusted gross income between and , inclusive?
Give an example, other than those presented in this section, of
a) Qualitative Variable
b) Discrete Qualitative Variable
c) Continuous Quantitative Variable
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