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 5, Problem 25E

a)

To determine

To explain W’s for the data.

a)

Expert Solution
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Explanation of Solution

Given:

  Stats: Modeling the World Nasta Edition Grades 9-12, Chapter 5, Problem 25E , additional homework tip  1

Let the general W’s are: Who, what, where, when and how.

We will see one by one.

Who: Volunteers or students.

What: Memory test

Where: Not given.

When: Not given.

Why: To find the effect of caffeine on memory retention.

How: Volunteers took a memory test 2 hours after drinking soda.

b)

To determine

To name variables with their type as categorical or quantitative.

b)

Expert Solution
Check Mark

Explanation of Solution

Given:

  Stats: Modeling the World Nasta Edition Grades 9-12, Chapter 5, Problem 25E , additional homework tip  2

The variables are: Types of soda and Memory test score.

The categorical variable: Types of soda.

The quantitative variable: Memory test score.

c)

To determine

To create a parallel boxplot.

c)

Expert Solution
Check Mark

Explanation of Solution

Given:

  Stats: Modeling the World Nasta Edition Grades 9-12, Chapter 5, Problem 25E , additional homework tip  3

Following is the parallel boxplot:

  Stats: Modeling the World Nasta Edition Grades 9-12, Chapter 5, Problem 25E , additional homework tip  4

d)

To determine

To explain the three groups.

d)

Expert Solution
Check Mark

Explanation of Solution

Given:

  Stats: Modeling the World Nasta Edition Grades 9-12, Chapter 5, Problem 25E , additional homework tip  5

  Stats: Modeling the World Nasta Edition Grades 9-12, Chapter 5, Problem 25E , additional homework tip  6

The shape of the distributions of No caffeine and High caffeine are left skewed. The shape of the distribution of Low caffeine is right skewed. The center of the distribution of No and Low caffeine is same. The spread of High caffeine is largest. But the spread of the No caffeine is smallest. There are no outliers represent by the boxplot.

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