Chapter 1.1, Problem 1.10E

a)

To determine

To find the population and sample from given study.

Answer to Problem 1.10E

Population is all different writings and sample is lengths of first 50 words from Harry Potter book.

Explanation of Solution

Given:

Different types of writing can sometimes be distinguished by the lengths of the words used. A student interested in this fact wants to study the lengths of words used by J. K. Rowling in her Harry Potter books. She opens a Harry Potter book at random and records the lengths of the first 50 words on the page.

First need to understand about sample and population.

Population: It is the set of all the possible individuals possessing the characteristic of interest in a study.

Sample: It is the subset of population on which, the actual study performed and from which, the necessary measurements are taken.

In given study,

Population: The different types of writing from all books.

Sample: The lengths of the first 50 words on the page from Harry Potter book.

b)

To determine

To find the variable.

Answer to Problem 1.10E

Variable is the length of words.

Explanation of Solution

The study is about the measurement of length of the words used by J.K Rowling.