Question

1. Protecting wood 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.

Answer 1

The categorical variable covers the category or the value of the label and puts a person into one group, whereas quantitative variables have a value and some measurements.

For Example: Age is a variable quantitative, as though it takes a figure value.

• Wood type (yellow, pine, cedar) — categorical
• Type (solvent, water-based) water repellent — categorical
• Paint (millimeter) — Quantitative paint thickness
• Color of paint (white, grey, blue light) — categorical
• Quantitative weathered time (months)

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