Stats: Modeling the World Nasta Edition Grades 9-12
Stats: Modeling the World Nasta Edition Grades 9-12
3rd Edition
ISBN: 9780131359581
Author: David E. Bock, Paul F. Velleman, Richard D. De Veaux
Publisher: PEARSON
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Chapter 3, Problem 35E

(a)

To determine

To find: the percent of total drivers are under 20.

(a)

Expert Solution
Check Mark

Answer to Problem 35E

4.7%

Explanation of Solution

Given:

  Stats: Modeling the World Nasta Edition Grades 9-12, Chapter 3, Problem 35E , additional homework tip  1

Calculation:

Total number of driver under age 20 = 93311640

Total number of driver = 200,665,267.

Therefore, the percent of total drivers under age 20 is

  9,331,640200,665,267×100=4.7%

Therefore, the percentage of total drivers under age 20 is 4.7%.

(b)

To determine

To find: the percent of total drivers are male.

(b)

Expert Solution
Check Mark

Answer to Problem 35E

50%

Explanation of Solution

Given:

  Stats: Modeling the World Nasta Edition Grades 9-12, Chapter 3, Problem 35E , additional homework tip  2

Calculation:

Total number of male drivers =100,389, 881

Total number of drivers =200,665,267.

Therefore the percentage of male drivers is

  100,389,881200,665,267×100=50.0%

Therefore, the percentage of male drivers is 50.0%.

(c)

To determine

To Explain: the few sentences comparing the number of female and male.

(c)

Expert Solution
Check Mark

Explanation of Solution

Given:

  Stats: Modeling the World Nasta Edition Grades 9-12, Chapter 3, Problem 35E , additional homework tip  3

Calculation:

Percentage of female and male licensed drivers in many age groups

    Age Male Driver (%) Female Driver (%)
    19 and under 51.2 48.8
    20-24 50.6 49.4
    25-29 50.6 49.4
    30-34 50.7 49.3
    35-39 50.7 49.3
    40-44 50.3 49.7
    45-49 50 50
    50-54 49.9 50.1
    55-59 49.9 50.1
    60-64 49.8 50.2
    65-69 49.6 50.4
    70-74 49 51
    75-79 47.5 52.5
    80-84 46.2 53.8
    85 and over 45.4 54.6

Graph:

  Stats: Modeling the World Nasta Edition Grades 9-12, Chapter 3, Problem 35E , additional homework tip  4

By seeing the graph, it is noticed that there is all equal number of male and female drivers in age group but as the age is increasing number of female drivers is also increasing in comparison to male drivers.

(d)

To determine

To Explain: that the Driver’s age and Sex represent to be independent.

(d)

Expert Solution
Check Mark

Explanation of Solution

By seeing the graph, it is noticed that there is all equal number of male and female drivers in age group but as the age is increasing number of female drivers is also increasing in comparison to male drivers. Therefore there is very easy association but a slight association between driver’s age and sex.

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