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Chapter 1: Q. 1 (page 7)

How can we help wood surfaces resist weathering, especially when restoring historic wooden buildings? In a study of this question, researchers prepared wooden panels and then exposed them to the weather. Here are some of the variables recorded: type of wood (yellow poplar, pine, cedar); type of water repellent (solvent-based, water-based); paint thickness (millimeters); paint color (white, gray, light blue); weathering time (months).

Identify each variable as categorical or quantitative.

Short Answer

Expert verified

The wood, paint colour and water-repellant are represented as categorical variables and weathering time and paint thickness are represented as quantitative variables.

Step by step solution

01

Categorical variables

Categorical variables are wood, paint colour and water repellent that takes on a limited number of possible values.

02

Quantitative variables

Quantitative variables are the paint thickness and weathering time that is measured on the numerical scale.

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Most popular questions from this chapter

The National Survey of Adolescent Health interviewed several thousand teens (grades 7 to 12). One question asked was “What do you think are the chances you will be married in the next ten years?” Here is a two-way table of the responses by gender:

Your percent from the previous exercise is part of

(a) the marginal distribution of females.

(b) the marginal distribution of gender.

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(d) the conditional distribution of gender among adolescents with a given opinion.

(e) the conditional distribution of opinion among adolescents of a given gender.

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